Pulping dust-containing and acid-containing waste gas integrated treatment equipment

Abstract

The utility model discloses pulping dust-containing and acid-containing waste gas integrated treatment equipment which comprises an alkali-washing and water-washing integrated tower, the alkali-washing and water-washing integrated tower comprises a cyclone separation tower and an exhaust funnel, an alkali liquor nozzle is arranged in an inlet pipeline of the cyclone separation tower, the exhaust funnel is arranged at the top of the cyclone separation tower, and the cyclone separation tower is connected with the exhaust funnel. The exhaust cylinder is communicated with an outlet of a center cylinder of the cyclone separation tower, the bottom of the exhaust cylinder is connected with a channel shell, the channel shell extends downwards from the top of an outer cylinder of the cyclone separation tower, a preset distance is reserved between the channel shell and the outer cylinder, a liquid flow channel is formed between the channel shell and the outer cylinder, and the bottom of the exhaust cylinder is communicated with the upper end of the liquid flow channel; a porous structure device is arranged above the central cylinder in the exhaust cylinder, a water spraying nozzle for spraying water downwards is arranged above the porous structure device in the exhaust cylinder, and a demister is arranged at an outlet of the exhaust cylinder; an outlet is formed in the bottom of the outer cylinder. The waste gas treatment device is high in integration level, the alkaline washing tower and the water washing tower are combined into a whole, and the waste gas treatment efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of environmental protection management, and specifically relates to integrated management equipment for pulping waste gas containing dust and acid. Background Art

[0002] With the rise of new energy, the lithium battery industry has developed rapidly. Among them, lithium carbonate and lithium hydroxide are two common lithium compounds. They can be used to manufacture lithium batteries and are widely used in mobile phones, laptops, new energy vehicles and other fields. The process of producing lithium compounds requires the use of a large amount of spodumene. The process of producing lithium compounds from spodumene requires high-temperature calcination in a rotary kiln, cooling, grinding, acid reaction and other processes. A large amount of dust-containing gas will be generated when the mineral powder is sent into the slurry tank by a belt conveyor, and a small amount of sulfuric acid mist will be generated in the later acid reaction stage. The generated dust-containing gas and sulfuric acid mist will have a very adverse effect on the environment and the health of workers in related processes. Therefore, in order to prevent and protect the environment and workers from being affected by these harmful factors, supporting environmental protection equipment is urgently needed in the production process of lithium compounds to eliminate the impact of acid-containing waste gas formed by dust-containing gas and sulfuric acid mist on the environment and people.

[0003] At present, in the production process of lithium compounds, only spray towers are used to treat dusty and acidic waste gas, or alkali washing towers + water washing towers are used to treat waste gas, which not only has low treatment efficiency but also has low integration and large floor space. With the further expansion of the scale of the lithium battery industry, the supporting environmental protection equipment of the work section urgently needs to be improved and upgraded to meet market demand. Therefore, it is particularly important to abandon the traditional concept of environmental protection equipment and continue to innovate and innovate technology. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the purpose of the utility model is to provide an integrated treatment device for pulping dust and acid waste gas. The utility model has a small footprint, low cost, high integration, and combines the alkali washing tower and the water washing tower into one, thereby improving the waste gas treatment efficiency.

[0005] The technical solution adopted by the utility model is as follows:

[0006] An integrated treatment device for pulping dust-containing and acid-containing waste gas comprises an alkali washing and water washing integrated tower, the alkali washing and water washing integrated tower comprises a cyclone separation tower and an exhaust chimney, the inlet of the cyclone separation tower can be connected to the waste gas pipeline for conveying flue gas, an alkali liquid nozzle is provided in the inlet pipeline of the cyclone separation tower, the exhaust chimney is arranged at the top of the cyclone separation tower, the exhaust chimney is connected with the outlet of the inner cylinder of the cyclone separation tower, the bottom of the exhaust chimney is connected with a channel shell, the channel shell extends downward from the top of the outer cylinder of the cyclone separation tower, a preset distance is left between the channel shell and the outer cylinder and a liquid flow channel is formed, the bottom of the exhaust chimney is connected with the upper end of the liquid flow channel; a multi-porous structure device is provided above the inner cylinder in the exhaust chimney, a water spray nozzle for spraying water downward is provided above the multi-porous structure device in the exhaust chimney, and a demister is provided at the outlet of the exhaust chimney; an outlet is provided at the bottom of the outer cylinder.

[0007] Preferably, the bottom of the outer cylinder is set to be an inverted cone, and the outlet of the bottom of the outer cylinder is arranged at the apex of the inverted cone.

[0008] Preferably, the porous structure device comprises a packing layer support and bulk packing arranged in the packing layer support, and a water retaining body for preventing water from entering the inner cylinder is provided in the packing layer support at a position directly opposite to the inner cylinder, and the radial dimension of the water retaining body is larger than the diameter of the inner cylinder.

[0009] Preferably, a backwash nozzle for flushing the bottom of the demister is provided in the exhaust pipe below the demister.

[0010] Preferably, the integrated treatment equipment for pulping dusty and acidic waste gas of the utility model also includes a dust collector, the inlet of the dust collector can be connected to the waste gas pipeline for conveying flue gas, and the gas outlet of the dust collector is connected to the inlet pipeline of the cyclone separation tower.

[0011] Preferably, the outlet of the dust collector is connected to a bellows, which is U-shaped with the ends on both sides of the bellows facing upward, one end of the bellows serving as the inlet end of the bellows, and the other end of the bellows serving as the gas outlet end of the bellows, the inlet end of the bellows being connected to the outlet of the dust collector, the gas outlet end of the bellows being connected to the inlet pipe of the cyclone separation tower, and an outlet being provided at the bottom of the bellows.

[0012] Preferably, an umbrella plate separator is provided inside the wind box at the outlet end of the wind box.

[0013] Preferably, the utility model of the integrated treatment equipment for pulping dust-containing and acid-containing waste gas also includes a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, wherein one end of the first pipeline and one end of the second pipeline can be connected to the waste gas pipeline for conveying flue gas, and the other end of the first pipeline is connected to the inlet of the dust collector; one end of the third pipeline is connected to the gas outlet end of the bellows, and the other end of the third pipeline and the other end of the second pipeline are both connected to one end of the fourth pipeline, and the other end of the fourth pipeline is connected to the inlet pipeline of the cyclone separation tower, and the first pipeline, the second pipeline and the third pipeline are all provided with cut-off air valves.

[0014] Preferably, the dust collector is a venturi dust collector.

[0015] Preferably, the utility model pulping dust and acid waste gas integrated treatment equipment also includes a clean water tank, an alkali solution tank, a sedimentation tank, a circulating water tank, an agitator, a circulating water pump, a scraping device, a circulating alkali solution pump, a clean water pump and an induced draft fan;

[0016] The outlet at the bottom of the bellows is connected to the inlet of the sedimentation tank, the outlet at the bottom of the outer cylinder is connected to the inlet of the alkali solution tank, and the lower end of the liquid flow channel is connected to the inlet of the clean water tank;

[0017] The circulating water pool and the sedimentation tank are partially separated by a baffle plate, and the tops of the circulating water pool and the sedimentation tank are connected. The scraping equipment is arranged in the sedimentation tank, the agitator is arranged in the circulating water pool, the inlet of the circulating water pump is arranged in the circulating water pool, the outlet of the circulating water pump is connected to the inlet of the venturi dust collector nozzle, the inlet of the circulating alkali liquid pump is arranged in the alkali liquid tank, the outlet of the circulating alkali liquid pump is connected to the inlet of the alkali liquid nozzle, the inlet of the clean water pump is arranged in the clean water tank, the outlet of the clean water pump is connected to the inlet of the water spray nozzle, and the inlet of the induced draft fan is connected to the upper port of the exhaust pipe.

[0018] The utility model has the following beneficial effects:

[0019] The utility model discloses an integrated treatment device for pulping dust-containing acid-containing waste gas, which is provided with an alkali washing and water washing integrated tower. The alkali washing and water washing integrated tower comprises a cyclone separation tower and an exhaust pipe. The pulping dust-containing acid-containing waste gas is sprayed by an alkali liquid nozzle in the inlet pipe of the cyclone separation tower, and then enters the alkali washing and water washing integrated tower (i.e., the inner cavity of the outer cylinder) along the tangent direction of the outer cylinder. The waste gas first rotates downward along the outer cylinder body, and then countercurrently enters the central cylinder after reaching the bottom. Compared with the traditional alkali spray tower, the utility model discloses an integrated alkali washing and water washing tower, which greatly prolongs the reaction time and improves the reaction efficiency. At the same time, the particulate matter in the waste gas can be separated by cyclone separation. The waste gas enters the exhaust pipe on the upper part of the tower body through the central cylinder, and enters the discharge port after being sprayed by water from the water spray nozzle and a demister. The liquid sprayed by the water spray nozzle flows down along the liquid flow channel and can be recycled. At the same time, the water in the liquid flow channel can also cool the outer cylinder. The utility model truly combines the alkali washing tower and the water washing tower into one, which reduces the cost, improves the reaction efficiency, and greatly saves the floor space. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the integrated treatment equipment for pulping dusty and acidic waste gas provided in an embodiment of the utility model.

[0021] Reference numerals:

[0022] 1. Exhaust gas pipeline; 1-1. First pipeline; 1-2. Second pipeline; 1-3. Third pipeline; 1-4. Fourth pipeline; 2. Venturi dust collector; 3. Alkali washing and water washing integrated tower; 3a. Bulk filler; 3b. Demister; 3c. Filling layer support; 3d. Round table; 4. Circulating water pool; 5. Sedimentation tank; 6. Alkali liquid tank; 7. Clear water tank; 8. Agitator; 9. Circulating water pump; 10. Slag scraping equipment; 11 , umbrella plate separator; 12, circulating alkali solution pump; 13, clean water pump; 14, induced draft fan; 15, cut-off air valve; 16, bellows; 17, cyclone separation tower; 17-1, outer cylinder; 17-2, central cylinder; 17-3, channel shell; 17-4, liquid flow channel; 17-5, cyclone separation tower inlet pipe; 17-6, alkali solution nozzle; 18, exhaust pipe; 19, water spray nozzle; 20, backwash nozzle. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described below in conjunction with the accompanying drawings in the present invention.

[0024] See also Figure 1The utility model pulping dust and acid waste gas integrated treatment equipment comprises an alkali washing and water washing integrated tower 3, the alkali washing and water washing integrated tower 3 comprises a cyclone separation tower 17 and an exhaust pipe 18, the inlet of the cyclone separation tower 17 can be connected to the exhaust gas pipeline 1 for conveying flue gas, an alkali liquid nozzle 17-6 is arranged in the inlet pipeline of the cyclone separation tower 17, the exhaust pipe 18 is arranged on the top of the cyclone separation tower 17, the exhaust pipe 18 is connected to the outlet of the central tube 17-2 of the cyclone separation tower 17, and the bottom of the exhaust pipe 18 is connected to a channel shell 17-3, The channel shell 17-3 extends downward from the top of the outer cylinder 17-1 of the cyclone separation tower 17, and a preset distance is left between the channel shell 17-3 and the outer cylinder 17-1 and a liquid flow channel 17-4 is formed. The bottom of the exhaust pipe 18 is connected with the upper end of the liquid flow channel 17-4; a porous structure device is provided above the central cylinder 17-2 in the exhaust pipe 18, and a water spray nozzle for spraying water downward is provided above the porous structure device in the exhaust pipe 18, and a demister 3b is provided at the outlet of the exhaust pipe 18; an outlet is provided at the bottom of the outer cylinder 17-1.

[0025] When the integrated treatment equipment for pulping dusty and acidic waste gas is used to treat pulping dusty and acidic waste gas, the method includes:

[0026] The pulping dust-containing acid-containing waste gas is sent to the inlet pipe of the cyclone separation tower 17. When the pulping dust-containing acid-containing waste gas passes through the inlet pipe of the cyclone separation tower 17, the alkali liquid nozzle 17-6 sprays alkali mist into the pulping dust-containing acid-containing waste gas. The mixture of the pulping dust-containing acid-containing waste gas and the alkali mist enters the outer cylinder 17-1 together for a rotating downward movement. During the movement, the particulate matter in the pulping dust-containing acid-containing waste gas is removed. At the same time, the acid in the pulping dust-containing acid-containing waste gas reacts with the alkali mist. The pulping dust-containing acid-containing waste gas after dust removal flows through the central cylinder 17-2 to the exhaust pipe 18. In the exhaust pipe 18, the pulping dust-containing acid-containing waste gas after dust removal flows through the porous structure device and the demister 3b in sequence. , and finally form clean waste gas; wherein, when the pulping dust-containing and acid-containing waste gas after dust removal flows through the porous structure device, the acid and alkali mist in the pulping dust-containing and acid-containing waste gas continue to react and exchange heat with the water sprayed from the water spray nozzle, so that the pulping dust-containing and acid-containing waste gas after dust removal is reduced, and the water sprayed from the water spray nozzle simultaneously flushes the porous structure device, and the flushed water is discharged through the liquid flow channel 17-4; when the pulping dust-containing and acid-containing waste gas after dust removal flows through the water spray nozzle, the water mist sprayed from the water spray nozzle is used to further cool down and slow down, and the pulping dust-containing and acid-containing waste gas after dust removal becomes clean waste gas containing water mist, and the clean waste gas containing water mist finally passes through the demister 3b to remove the water mist.

[0027] As an optional solution of the above solution of the utility model, the bottom of the outer cylinder 17-1 is set to be an inverted cone, and the outlet at the bottom of the outer cylinder 17-1 is set at the apex of the inverted cone, which is conducive to timely discharge of the liquid collected at the bottom of the outer cylinder 17-1.

[0028] As an optional solution of the above scheme of the utility model, the porous structure device includes a packing layer support 3c and a bulk filler 3a arranged in the packing layer support 3c, and a water retaining body for preventing water from entering the central tube 17-2 is provided in the packing layer support 3c at a position directly opposite to the central tube 17-2, and the radial dimension of the water retaining body is larger than the diameter of the central tube 17-2. Among them, the bulk filler 3a can provide more pore channels, so that the acid in the exhaust gas and the sprayed alkali can further fully react, and at the same time, the abundant pore channels are also conducive to releasing the heat generated by the neutralization of acid and alkali, which is convenient for full heat exchange with the water sprayed from the water spray nozzle. On the one hand, the water retaining body can prevent water from flowing into the central tube 17-2 to reduce the reaction effect of the waste and the alkali, and on the other hand, it can also evenly distribute the exhaust gas flowing out of the central tube 17-2 in the exhaust pipe 18, which is conducive to spray cooling and full reaction of acid and alkali. Optionally, the water retaining body can be a truncated cone 3d, with the small end of the truncated cone 3d facing upward and the large end facing downward, the diameter of the large end is larger than the diameter of the central tube 17-2, and the bulk filler 3a is evenly distributed in the area between the side of the truncated cone 3d and the inner wall of the exhaust pipe 18.

[0029] As a preferred solution of the utility model, on the basis of the above solution, a backwash nozzle for flushing the bottom of the defogger 3b is provided in the exhaust pipe 18 below the defogger 3b. Flushing the bottom of the defogger 3b with the backwash nozzle can prevent the incompletely removed particles from clogging the defogger 3b, so that the defogger 3b maintains a good defog effect for a long time.

[0030] As a preferred solution of the utility model, on the basis of the above solution, the utility model pulping dust and acid waste gas integrated treatment equipment can also be provided with a dust collector, the inlet of the dust collector can be connected to the waste gas pipeline 1 for conveying flue gas, and the gas outlet of the dust collector is connected to the inlet pipeline of the cyclone separation tower 17. The dust collector can perform a large amount of dust removal in advance to reduce the dust removal pressure of the cyclone separation tower 17 and improve the dust removal effect.

[0031] As a preferred solution of the utility model, on the basis of the above solution, a bellows 16 is connected to the outlet of the dust collector, and the bellows 16 is in a U-shape. Figure 1 For example, the convex parts on the left and right sides of the wind box 16 are recorded as the left and right sides of the wind box 16, and the part where the left and right sides of the wind box 16 are connected is recorded as the bottom of the wind box 16. The ends of the wind box 16 are facing upward, one end of the wind box 16 is used as the inlet end of the wind box 16, and the other end of the wind box 16 is used as the gas outlet end of the wind box 16. The inlet end of the wind box 16 is connected to the outlet of the dust collector, and the gas outlet end of the wind box 16 is connected to the inlet pipe of the cyclone separation tower 17. An outlet is provided at the bottom of the wind box 16. The wind box 16 with this structure can further improve the dust removal effect.

[0032] As a preferred solution of the utility model, on the basis of the above solution, an umbrella plate separator 11 is provided at the outlet end of the bellows 16 inside the bellows 16. The umbrella plate separator 11 has the effect of blocking particulate matter and water, which is beneficial to reducing the dust removal and acid removal pressure of the alkaline washing and water washing integrated tower 3.

[0033] As a preferred scheme of the present invention, on the basis of the above scheme, the integrated treatment equipment for pulping dust-containing and acid-containing waste gas of the present invention also includes a first pipeline 1-1, a second pipeline 1-2, a third pipeline 1-3 and a fourth pipeline 1-4, wherein one end of the first pipeline 1-1 and one end of the second pipeline 1-2 can be connected to the waste gas pipeline 1 for conveying flue gas, and the other end of the first pipeline 1-1 is connected to the inlet of the dust collector; one end of the third pipeline 1-3 is connected to the gas outlet end of the bellows 16, the other end of the third pipeline 1-3 and the other end of the second pipeline 1-2 are both connected to one end of the fourth pipeline 1-4, and the other end of the fourth pipeline 1-4 is connected to the inlet pipeline of the cyclone separation tower 17, and the first pipeline 1-1, the second pipeline 1-2 and the third pipeline 1-3 are all provided with a cut-off air valve 15. In the above structure, by cutting off the control of the air valve 15, the treatment method of the exhaust gas can be controlled, that is, directly entering the alkali washing and water washing integrated tower 3 for treatment, or pre-treated by the venturi dust collector 2 and the bellows 16 before entering the alkali washing and water washing integrated tower 3 for treatment.

[0034] As a preferred solution of the present invention, the dust collector of the present invention can adopt a venturi dust collector 2, which has the characteristic of good dust removal effect.

[0035] As a preferred solution of the utility model, the utility model pulping dust and acid waste gas integrated treatment equipment is also equipped with relevant auxiliary devices, the auxiliary devices include a clean water tank 7, an alkali solution tank 6, a sedimentation tank 5, a circulating water tank 4, an agitator 8, a circulating water pump 9, a scraping device 10, a circulating alkali solution pump 12, a clean water pump 13 and an induced draft fan 14;

[0036] The outlet at the bottom of the bellows 16 is connected to the inlet of the sedimentation tank 5, and the wastewater and particulate matter generated in the bellows 16 can be discharged into the sedimentation tank 5 for treatment; the outlet at the bottom of the outer cylinder 17-1 is connected to the inlet of the alkali liquid tank 6, and the lower end of the liquid flow channel 17-4 is connected to the inlet of the clean water tank 7;

[0037] The circulating water pool 4 and the sedimentation tank 5 are partially separated by a baffle plate, and the tops of the circulating water pool 4 and the sedimentation tank 5 are connected. The scraping equipment 10 is arranged in the sedimentation tank 5, the agitator 8 is arranged in the circulating water pool 4, the inlet of the circulating water pump 9 is arranged in the circulating water pool 4, and the outlet of the circulating water pump 9 is connected to the inlet of the nozzle of the venturi dust collector 2, the inlet of the circulating alkali liquid pump 12 is arranged in the alkali liquid tank 6, and the outlet of the circulating alkali liquid pump 12 is connected to the inlet of the alkali liquid nozzle 17-6, the inlet of the clean water pump 13 is arranged in the clean water pool 7, and the outlet of the clean water pump 13 is connected to the inlet of the water spray nozzle, and the inlet of the induced draft fan 14 is connected to the upper port of the exhaust pipe 18.

[0038] In the present invention, a filtering device may be provided at the outlet at the bottom of the outer cylinder 17-1 and / or the inlet end of the circulating alkali solution pump 12, through which particles separated by the cyclone separation tower 17 are filtered out to prevent the alkali solution nozzle 17-6 from being blocked.

[0039] Example

[0040] See also Figure 1The integrated treatment equipment for pulping dusty and acidic waste gas of the preferred embodiment of the present embodiment comprises a venturi dust collector 2, an alkali washing and water washing integrated tower 3, a clean water tank 7, an alkali solution tank 6, a sedimentation tank 5, a circulating water tank 4, an agitator 8, a circulating water pump 9, a scraping device 10, an umbrella plate separator 11, a circulating alkali solution pump 12, a clean water pump 13, and an induced draft fan 14. The venturi dust collector 2 is connected to the waste gas pipeline 1 through a first pipeline 1-1, and the outlet of the venturi dust collector 2 is connected to a bellows 16, and the bottom of the bellows 16 is connected to the exhaust gas pipeline 1 through a first pipeline 1-1. The outlet is connected to the liquid receiving port on the upper part of the sedimentation tank 5; the bottom outlet of the outer cylinder 17-1 in the alkali washing and water washing integrated tower 3 is connected to the liquid receiving port on the top of the alkali liquid tank 6; the alkali liquid tank 6 and the clean water tank 7 are separated by a baffle; the circulating water tank 4 and the sedimentation tank 5 are partially separated by the baffle, and the tops of the circulating water tank 4 and the sedimentation tank 5 are connected, and the sedimentation tank 5 is located at the lower part of the venturi dust collector 2; the alkali liquid tank 6 and the sedimentation tank 5 are separated by a baffle; the first pipeline 1-1 connected to the air inlet of the venturi dust collector 2 is provided with The third pipe 1-3 connected to the air outlet of the cut-off air valve 15 and the bellows 16 is provided with a cut-off air valve 15. The exhaust gas can enter the air inlet of the venturi dust collector 2 through the exhaust gas pipe 1 and the first pipe 1-1, and can directly enter the air inlet of the alkali washing and water washing integrated tower 3 through the second pipe 1-2 and the fourth pipe 1-4; the air outlet of the alkali washing and water washing integrated tower 3 (i.e., the upper port of the exhaust pipe 18) is connected to the inlet of the induced draft fan 14 through a pipe; the circulating water pump 9 is located at the top of the circulating water pool 4 The circulating water pump 9 is connected to the nozzle of the venturi dust collector 2 through a pipeline; the circulating alkali solution pump 12 is located at the top of the alkali solution tank 6, and the circulating alkali solution pump 12 is connected to the alkali solution nozzle 17-6 in the air inlet of the alkali washing and water washing integrated tower 3 (that is, the cyclone separation tower inlet pipeline 17-5) through a pipeline; the clean water pump 13 is connected to the upper two layers of nozzles of the alkali washing and water washing integrated tower 3 (that is, the water spray nozzle 19 above the porous structure device and the backwash nozzle 20 below the demister 3b) through a pipeline.

[0041] in:

[0042] The venturi dust collector 2 is used for cooling and dust removal, and at the same time pre-washing the acid gas sulfuric acid mist.

[0043] The umbrella plate separator 11 is used for gas-liquid separation, reducing the humidity of the exhaust gas and further removing dust.

[0044] The main function of the alkali washing and water washing integrated tower 3 is to absorb the sulfuric acid mist in the exhaust gas, and at the same time, it can further remove the remaining trace dust in the exhaust gas.

[0045] The sedimentation tank 5 is used to collect the large dust particles captured by the venturi dust collector 2 to form sludge sediment, which is further removed by the scraping device 10 for transportation.

[0046] The circulating water pool 4 is used to ensure that the nozzles of the venturi dust collector 2 have water, and the clean water pool 7 and the alkali solution tank 6 are used to ensure that the nozzles inside the alkali washing and water washing integrated tower 3 have liquid.

[0047] The circulating water pool 4 monitors the wastewater turbidity in real time through a turbidity meter installed on the top, so as to realize regular replacement of the circulating wastewater.

[0048] The alkali solution tank 6 monitors the alkalinity of the wastewater in real time through a pH meter installed on the top, so as to replenish the alkali solution regularly.

[0049] The inside of the alkali washing and water washing integrated tower 3 and the alkali solution tank 6 is sprayed with Teflon anti-corrosion material.

[0050] The circulating water pool also comprises a stirrer, a process water replenishment port, an observation hole, and a turbidity meter. The turbidity meter is installed on the top of the circulating water pool, and the probe rod is in contact with the liquid.

[0051] The sedimentation tank also includes scraping equipment, silt removal ports, and top bellows containing umbrella plate separators.

[0052] The scraping equipment adopts top guide rolling scraping or automatic scraping machine.

[0053] The alkali solution tank also comprises an alkali solution replenishing port and a pH meter. The pH meter is installed on the top of the alkali solution tank, and the probe rod is in contact with the liquid.

[0054] The exhaust gas duct 1 is equipped with an air volume sensor, a pressure transmitter and a temperature transmitter.

[0055] The induced draft fan adopts a centrifugal fan, and a pressure transmitter is installed in front of the fan.

[0056] More specifically:

[0057] The integrated treatment equipment for pulping dusty and acidic waste gas in this embodiment is made of SUS304 stainless steel with a thickness of not less than 4 mm. The inside of the alkali washing and water washing integrated tower 3 and the alkali solution tank 6 are sprayed with Teflon anti-corrosion material, and the Teflon spraying thickness is not less than 50 μm. The alkali solution used is a 10% NaOH solution.

[0058] The internal nozzle of the venturi dust collector 2 adopts an anti-clogging type spiral nozzle.

[0059] The water spray nozzle at the top of the alkaline washing and water washing integrated tower 3 adopts an anti-blocking spiral nozzle, the center of the packing layer bracket 3c is separated by a hollow truncated cone, and SUS304 stainless steel ball ring packing is scattered around. The exhaust gas outlet pipe is installed with a stainless steel baffle demister, and a backwash nozzle is installed at the bottom. The backwash nozzle also adopts a spiral nozzle to prevent the demister from being blocked and affecting the operation of the system. The water washing tower water channel (i.e., the liquid flow channel 17-4) adopts the channel shell 17-3 and the outer wall of the outer cylinder 17-1 to form a cavity channel. The bottom of the liquid flow channel 17-4 is connected to the clean water tank 7. The channel shell 17-3 adopts an arc-shaped baffle structure, which can block part of the water channel to prevent excessive air from mixing.

[0060] The alkali solution spray nozzle 17-6 at the inlet section of the alkali washing and water washing integrated tower 3 adopts a fan-shaped nozzle, which is arranged in multiple layers perpendicular to the air flow direction, so that the exhaust gas is evenly contacted with the alkali solution, thereby improving the reaction efficiency.

[0061] The induced draft fan 14 is made of SUS304 material and a centrifugal fan; the circulating water pump 9 and the circulating alkali solution pump 12 are made of cast steel + F46 lining anti-corrosion material; the agitator 8 is made of SUS304 stainless steel.

[0062] The upper solution of the sedimentation tank 5 flows into the circulating water tank 4 by gravity. In the initial state, the water level of the sedimentation tank 5 is at the same height as the baffle, and gravity flow can be achieved during operation.

[0063] The treatment process of the above-mentioned integrated treatment equipment for pulping dust and acid waste gas: the acid and dust waste gas passes through the throat of the venturi dust collector 2 at a high speed, collides with the spray droplets in the throat to form large particles that settle down and fall into the sedimentation tank 5, and the clean airflow passes through the umbrella plate separator 11 in the air outlet of the U-shaped bellows at the top of the sedimentation tank 5, and the undeposited large particles of dust and part of the droplets are intercepted. The waste gas is sprayed by the alkali liquid nozzle in the air inlet of the alkali washing and water washing integrated tower 3 and then enters the cyclone separation tower 17 along the tangential direction. The waste gas first rotates downward along the outer cylinder, and then countercurrently enters the central cylinder after reaching the bottom. The waste gas enters the upper part of the cyclone separation tower 17 through the central cylinder, and enters the induced draft fan 14 after passing through the water spray and the demister 3b, and is discharged through the exhaust pipe to meet the standards. The sprayed liquid flows into the clean water tank 7 along the gap between the inner and outer walls for recycling.

[0064] Regarding dust removal: Acidic and dusty waste gas passes through the throat of the venturi dust collector 2 at high speed, collides with the spray droplets in the throat to form large particles that are separated and settled by gravity and fall into the sedimentation tank 5. Then the airflow collides with the umbrella plate separator 11 for further dust removal. The rotating motion of the waste gas inside the alkali washing and water washing integrated tower at the rear end generates centrifugal force, and large particles of dust can also be further centrifugally separated. Small particles of dust are further filtered through the end water spray. Dust removal is carried out through multiple equipment, which greatly enhances the dust removal effect.

[0065] Regarding the removal of acid mist: the acid- and dust-containing waste gas is first washed by the venturi dust collector 2, and water spray absorbs part of the acid mist, and then enters the alkaline washing and water washing integrated tower 3 tangentially to react with the caustic soda solution sprayed at the inlet. The airflow first forms a rotating and descending external swirling airflow, and continuously merges into the central tube during the descent process, forming a radial inward airflow with the same rotation direction as the external swirling flow, which increases the reaction time and can remove the sulfuric acid mist through neutralization reaction.

[0066] Regarding the cooling and purification of waste gas: the acid addition reaction section involves the dilution of concentrated sulfuric acid, and the waste gas will inevitably generate temperature. The temperature is monitored in real time by installing a temperature transmitter at the inlet of the waste gas equipment. The waste gas passes through the venturi dust collector 2, and the sprayed water mist absorbs heat. The water mist sprayed on the top of the alkali washing and water washing integrated tower 3 further absorbs heat to reduce the waste gas temperature. At the same time, the water mist sprayed on the top can also wash away the slightly excess caustic soda solution.

[0067] In this embodiment, the above-mentioned integrated treatment equipment for pulping dusty and acidic waste gas is equipped with a venturi dust collector. The acidic and dusty waste gas passes through the throat of the venturi dust collector at a high speed, collides with the spray droplets in the throat to form large particles that settle down and fall into the sedimentation tank. The clean airflow passes through the umbrella plate separator in the air outlet of the bellows at the top of the sedimentation tank, and the undeposited large particles of dust and part of the droplets are intercepted. The combination of the venturi dust collector and the umbrella plate separator improves the dust removal efficiency and greatly reduces the load of subsequent treatment facilities. The utility model is equipped with an alkali washing and water washing integrated tower at the rear end of the venturi dust collector, and the waste gas After being sprayed by the alkali liquid nozzle in the air inlet of the alkali washing and water washing integrated tower, the exhaust gas first rotates downward along the outer cylinder, and then countercurrently enters the central cylinder after reaching the bottom. Compared with the traditional alkali spray tower, the reaction time is greatly prolonged and the reaction efficiency is improved; the exhaust gas enters the upper part of the tower through the central cylinder, and after passing through the water spray and demister, it enters the induced draft fan and is discharged through the exhaust pipe to meet the standards. The sprayed liquid flows into the clear water tank along the gaps between the inner and outer walls, truly combining the alkali washing tower and the water washing tower into one, reducing costs, improving reaction efficiency, and greatly saving floor space.

[0068] Furthermore, the waste gas contains a large amount of dust, and the dust removal pressure of the venturi dust collector is relatively high. A bypass system is also provided in the waste gas pipeline. By cutting off the air valve, the venturi dust collector can be isolated, which facilitates the maintenance of the venturi dust collector.

[0069] It can be seen from the above scheme that the utility model has the following advantages:

[0070] 1. Combining the principle of cyclone dust collector, the traditional alkali washing tower and water washing tower are combined into one. Under the premise of unchanged functions, the equipment cost is greatly reduced.

[0071] 2. The Venturi dust collector and the alkaline washing and water washing integrated tower complement each other. In addition to dust removal, the Venturi dust collector can pre-treat the acid gas; in addition to absorbing and removing sulfuric acid mist, the alkaline washing and water washing integrated tower can further remove dust particles in the exhaust gas. The combination of the two greatly improves the reaction efficiency, and a smaller equipment size can achieve the same removal effect.

[0072] 3. The integrated treatment equipment for dusty and acidic waste gas has high integration, small footprint, great operational flexibility, high reaction efficiency and low price. The specifications can be customized according to the waste gas air volume, and the equipment configuration is flexible. The number of venturi dust collectors can be customized according to the working conditions, and a series of products can be made.

Claims

1. An integrated treatment device for pulping dusty and acidic waste gas, characterized in that: The invention comprises an alkali washing and water washing integrated tower (3), wherein the alkali washing and water washing integrated tower (3) comprises a cyclone separation tower (17) and an exhaust pipe (18), wherein the inlet of the cyclone separation tower (17) can be connected to an exhaust gas pipeline (1) for conveying flue gas, an alkali liquid nozzle (17-6) is arranged in the inlet pipeline of the cyclone separation tower (17), the exhaust pipe (18) is arranged at the top of the cyclone separation tower (17), the exhaust pipe (18) is communicated with the outlet of the inner cylinder (17-2) of the cyclone separation tower (17), the bottom of the exhaust pipe (18) is connected to a channel shell (17-3), and the channel shell (17-3) ) extends downward from the top of the outer cylinder (17-1) of the cyclone separation tower (17); a preset spacing is left between the channel shell (17-3) and the outer cylinder (17-1) and a liquid flow channel (17-4) is formed; the bottom of the exhaust pipe (18) is connected to the upper end of the liquid flow channel (17-4); a multi-porous structure device is provided above the inner cylinder (17-2) in the exhaust pipe (18); a water spray nozzle for spraying water downward is provided above the multi-porous structure device in the exhaust pipe (18); a demister (3b) is provided at the outlet of the exhaust pipe (18); and an outlet is provided at the bottom of the outer cylinder (17-1).

2. The integrated treatment equipment for pulping dusty and acidic waste gas according to claim 1 is characterized in that: The bottom of the outer cylinder (17-1) is set to be an inverted cone, and the outlet at the bottom of the outer cylinder (17-1) is set at the top of the inverted cone.

3. The integrated treatment equipment for pulping dusty and acidic waste gas according to claim 1 is characterized in that: The porous structure device comprises a packing layer support (3c) and a bulk packing (3a) arranged in the packing layer support (3c); a water retaining body for preventing water from entering the inner cylinder (17-2) is provided in the packing layer support (3c) at a position directly opposite to the inner cylinder (17-2); and the radial dimension of the water retaining body is greater than the diameter of the inner cylinder (17-2).

4. The integrated treatment equipment for pulping dusty and acidic waste gas according to claim 1 is characterized in that: A backwash nozzle for flushing the bottom of the demister (3b) is provided in the exhaust pipe (18) below the demister (3b).

5. The integrated treatment equipment for pulping dusty and acidic waste gas according to claim 1 is characterized in that: It also comprises a dust collector, the inlet of which can be connected to an exhaust gas pipeline (1) for conveying flue gas, and the gas outlet of the dust collector is connected to an inlet pipeline of a cyclone separation tower (17).

6. The integrated treatment equipment for pulping dusty and acidic waste gas according to claim 5 is characterized in that: The outlet of the dust collector is connected to a bellows (16). The bellows (16) is U-shaped, with the ends of both sides of the bellows (16) facing upwards. One end of the bellows (16) serves as an inlet end of the bellows (16), and the other end of the bellows (16) serves as a gas outlet end of the bellows (16). The inlet end of the bellows (16) is connected to the outlet of the dust collector, and the gas outlet end of the bellows (16) is connected to an inlet pipe of a cyclone separation tower (17). An outlet is provided at the bottom of the bellows (16).

7. The integrated treatment equipment for pulping dusty and acidic waste gas according to claim 6 is characterized in that: The outlet end of the wind box (16) is provided with an umbrella plate separator (11) inside the wind box (16).

8. The integrated treatment equipment for pulping dusty and acidic waste gas according to claim 6 is characterized in that: The invention also comprises a first pipeline (1-1), a second pipeline (1-2), a third pipeline (1-3) and a fourth pipeline (1-4), wherein one end of the first pipeline (1-1) and one end of the second pipeline (1-2) can be connected to an exhaust gas pipeline (1) for conveying flue gas, and the other end of the first pipeline (1-1) is connected to the inlet of a dust collector; one end of the third pipeline (1-3) is connected to the gas outlet end of a wind box (16), the other end of the third pipeline (1-3) and the other end of the second pipeline (1-2) are both in communication with one end of a fourth pipeline (1-4), and the other end of the fourth pipeline (1-4) is connected to the inlet pipeline of a cyclone separation tower (17); and the first pipeline (1-1), the second pipeline (1-2) and the third pipeline (1-3) are all provided with a cut-off air valve (15).

9. An integrated treatment device for pulping dusty and acidic waste gas according to any one of claims 6 to 8, characterized in that: The dust collector is a venturi dust collector (2).

10. The integrated treatment equipment for pulping dusty and acidic waste gas according to claim 9, characterized in that: It also includes a clean water tank (7), an alkali solution tank (6), a sedimentation tank (5), a circulating water tank (4), an agitator (8), a circulating water pump (9), a scraping device (10), a circulating alkali solution pump (12), a clean water pump (13) and an induced draft fan (14); The outlet at the bottom of the bellows (16) is connected to the inlet of the sedimentation tank (5), the outlet at the bottom of the outer cylinder (17-1) is connected to the inlet of the alkali liquid tank (6), and the lower end of the liquid flow channel (17-4) is connected to the inlet of the clear water tank (7); The circulating water pool (4) and the sedimentation pool (5) are partially separated by a baffle plate. The tops of the circulating water pool (4) and the sedimentation pool (5) are connected. The scraping device (10) is arranged in the sedimentation pool (5). The agitator (8) is arranged in the circulating water pool (4). The inlet of the circulating water pump (9) is arranged in the circulating water pool (4). The outlet of the circulating water pump (9) is connected to the inlet of the nozzle of the venturi dust collector (2). The inlet of the circulating alkali liquid pump (12) is arranged in the alkali liquid tank (6). The outlet of the circulating alkali liquid pump (12) is connected to the inlet of the alkali liquid nozzle (17-6). The inlet of the clean water pump (13) is arranged in the clean water pool (7). The outlet of the clean water pump (13) is connected to the inlet of the water spray nozzle. The inlet of the induced draft fan (14) is connected to the upper end of the exhaust pipe (18).

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