Automatically-controlled acid-base spray washing device

Abstract

The utility model discloses an automatic control acid-base spray washing device which comprises induced draft fans which are sequentially connected through pipelines, an acid-base washing pool, a packing layer, a spray device and a gas concentration sensor are sequentially arranged in an acid-base washing tower from bottom to top, the acid-base washing pool is connected with the spray device through a circulating pipeline and a circulating pump, and the gas concentration sensor is connected with the packing layer. The PLC control system adjusts the flow of the circulating water pump according to the feedback of the gas concentration sensor and the on-line pH detector so as to adjust the spraying amount of the spraying device in real time, after the spraying device sprays the filler layer, a large amount of acid liquor or alkali liquor is attached to activated carbon in the filler layer so as to achieve acid-base adjustment of waste gas, and therefore a better leaching effect is achieved. In addition, the packing layer is combined with the interior of the acid-alkali washing tower through pulleys and chutes, and the packing layer is in interference fit with the net rack through ring handles of polytetrafluoroethylene cloth bags, so that the packing layer is easy to disassemble, assemble and replace.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste gas treatment device technical field, concretely relates to a kind of automatic control acid-base spray washing device. BACKGROUND

[0002] A large amount of acidic or alkaline gas will be produced in the production process of acrylate, which has chronic toxic effects on human health and does not meet the national emission standards, so it needs to be purified. The scrubber is a kind of gas purification equipment, which realizes the purification of the gas by contacting the waste gas containing acidic or alkaline gas with the scrubbing liquid containing alkali or acid agent. The acidic or alkaline components in the waste gas react with the alkali or acid agent in the scrubbing liquid, thereby being removed. The scrubbing liquid is usually recycled in the scrubber, and is pumped from the bottom to the top of the tower by the circulating pump, and then sprayed by the spraying system. Although the acid-base spray washing technology is relatively mature, when dealing with waste gas with fluctuating concentration within a certain range, the existing technology cannot dynamically adjust the spraying amount of the spraying system, which causes waste of resources.

[0003] The utility model patent with publication number CN201678505U discloses a pH online detection variable-frequency dosing automatic device. CONTENT

[0004] The utility model aims at overcoming the deficiency of prior art, and provides an automatic control acid-base spray washing device for real-time dynamic adjustment of the spraying system and improvement of its working efficiency.

[0005] To achieve the above-mentioned purpose, the utility model provides the technical scheme as follows:

[0006] An automatic control acid-base spray washing device comprises an air inlet pipe, an air inlet pipe provided with an air induction fan, an air inlet pipe sequentially connected with an acid washing tower and an alkali washing tower, and a spraying device arranged at the top of the acid washing tower and the alkali washing tower.

[0007] The bottom of the acid washing tower is provided with an acid washing tank, the acid washing tank is provided with a first online pH detector, the acid washing tank is connected to the spraying device at the top of the acid washing tower through a first circulating pipeline and a first circulating pump, and the top of the acid washing tower is provided with a first gas concentration sensor.

[0008] The bottom of the alkali washing tower is provided with an alkali washing tank, the alkali washing tank is provided with a second online pH detector, the alkali washing tank is connected to the spraying device at the top of the alkali washing tower through a second circulating pipeline and a second pressure pump, and the top of the alkali washing tower is provided with a second gas concentration sensor and an exhaust pipe.

[0009] The first circulating pump, the second circulating pump, the first online pH detector, the second online pH detector, the first gas concentration sensor and the second gas concentration sensor are electrically connected with the PLC control system.

[0010] Further, the acid washing tank and the alkali washing tank are also respectively provided with a first electric contact type liquid level meter and a second electric contact type liquid level meter, and the first electric contact type liquid level meter and the second electric contact type liquid level meter are electrically connected with the PLC control system.

[0011] Further, the acid washing tower and the alkali washing tower are respectively connected with an acid adjusting storage tank and an alkali adjusting storage tank, the acid adjusting storage tank is communicated with the acid washing tank through a first electronic valve, the alkali adjusting storage tank is communicated with the alkali washing tank through a second electronic valve, and the first electronic valve and the second electronic valve are electrically connected with the PLC control system.

[0012] Further, the acid adjusting storage tank and the alkali adjusting storage tank are respectively filled with an acid buffer and an alkali buffer.

[0013] Further, the spraying device comprises a rotary spray head provided with a spiral nozzle, and the acid washing tower and the alkali washing tower are internally provided with an air flow distribution plate and a wire mesh demister.

[0014] Further, the acid washing tank and the alkali washing tank are respectively connected to the crystal slurry tank through a third electronic valve and a fourth electronic valve, and the third electronic valve and the fourth electronic valve are electrically connected with the PLC control system.

[0015] Further, the acid washing tower and the alkali washing tower are provided with a manhole on the side surface, and the acid washing tower and the alkali washing tower are internally provided with a filler layer filled with activated carbon.

[0016] In order to facilitate the replacement and maintenance of the filler layer, the technical scheme further comprises that a support ring is arranged in the acid washing tower and the alkali washing tower, a net rack is arranged on the support ring, the filler layer is arranged on the net rack, and the filler layer is composed of a plurality of polytetrafluoroethylene cloth bags.

[0017] Further, each polytetrafluoroethylene cloth bag is independently provided with a ring handle in interference fit with the net rack, and the ring handle is provided with an opening facilitating gripping.

[0018] Further, a pulley is fixedly arranged at the outer edge of the net rack downward, and the support ring is provided with a sliding groove matched with the pulley.

[0019] The advantages and beneficial effects of the utility model are as follows:

[0020] 1. The online pH detector and the gas concentration sensor are provided, the pH value of the acid washing tank and the alkali washing tank and the concentration of the effluent waste gas can be monitored in real time, the stability and efficiency of the treatment process are ensured, the acid washing and alkali washing process are automatically controlled, the pressure of the circulating pump is adjusted, the pressure and release amount of the spraying liquid are dynamically adjusted, the acid or alkali pollutants in the waste gas are efficiently removed, the waste gas is purified, and the environmental protection emission standard is met.

[0021] 2、 The acid washing tank and the alkali washing tank are connected with a crystal slurry tank through electronic valves, can be used for mixing acid and alkali into salt, and then the crystallized salt can be recovered through a centrifugal desalting device and the like, the electronic valves adjust the mixing ratio, the excess of acid or alkali is avoided, and thus the wastewater pollution caused by the discharge of acid and alkali is reduced.

[0022] 3、 The structure design of the filler layer is optimized, the activated carbon is packaged in a polytetrafluoroethylene cloth bag, the polytetrafluoroethylene cloth bag is provided with an interference fit ring handle, maintenance is facilitated, and a net frame is matched with a pulley, so that an operator can rotate the net frame to more easily take the polytetrafluoroethylene cloth bag on the other side of the tower. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a structural schematic diagram of an embodiment of the utility model;

[0024] Fig. 2 is an enlarged structural schematic diagram of the position A of the embodiment of the utility model;

[0025] Fig. 3 is an enlarged structural schematic diagram of the position B of the embodiment of the utility model;

[0026] In the drawings:

[0027] 1-gas inlet pipe, 2-induced draft fan, 3-acid washing tower, 4-alkali washing tower, 5-acid washing tank, 6-alkali washing tank, 7-first on-line pH detector, 8-second on-line pH detector, 9-first circulation pipeline, 10-first circulation pump, 11-second circulation pipeline, 12-second circulation pump, 13-first gas concentration sensor, 14-second gas concentration sensor, 15-acid adjusting storage tank, 16-alkali adjusting storage tank, 17-first electronic valve, 18-second electronic valve, 19-first electric contact type liquid level meter, 20-second electric contact type liquid level meter, 21-rotary spray head, 22-spiral nozzle, 23-gas flow distribution plate, 24-wire mesh demister, 25-third electronic valve, 26-fourth electronic valve, 27-crystal slurry tank, 28-access door, 29-filler layer, 30-supporting ring, 31-net frame, 32-polytetrafluoroethylene cloth bag, 33-ring handle, 34-opening, 35-pulley, 36-sliding groove, 37-exhaust pipe. DETAILED DESCRIPTION

[0028] The specific implementation of the utility model will be further described in combination with the drawings and the embodiments. The following embodiments are only used to more clearly illustrate the technical scheme of the utility model, and cannot be used to limit the protection scope of the utility model.

[0029] EMBODIMENT

[0030] Please refer to Figs. 1-3The utility model relates to an automatic control acid-base spray washing device, which comprises an air inlet pipe 1 connected with a gas collecting hood, the air inlet pipe 1 is sequentially communicated with an air draught fan 2, an acid washing tower 3 and an alkali washing tower 4, and the acid washing tower 3 and the alkali washing tower 4 are provided with spray devices. The acid washing tower 3 is provided with an acid washing tank 5 at the bottom, the acid washing tank 5 is provided with a first on-line pH detector 7, the acid washing tank 5 is connected to the spray device at the top of the acid washing tower 3 through a first circulating pipeline 9 and a first circulating pump 10, and the acid washing tower 3 is further provided with a first gas concentration sensor 13 at the top. The alkali washing tower 4 is provided with an alkali washing tank 6 at the bottom, the alkali washing tank 6 is provided with a second on-line pH detector 8, the alkali washing tank 6 is connected to the spray device at the top of the alkali washing tower 4 through a second circulating pipeline 11 and a second circulating pump 12, and the alkali washing tower 4 is provided with a second gas concentration sensor 14 and an exhaust pipe 37 at the top. The first circulating pump 10, the second circulating pump 12, the first on-line pH detector 7, the second on-line pH detector 8, the first gas concentration sensor 13 and the second gas concentration sensor 14 are connected to a PLC control system through an electric circuit.

[0031] The acid washing tower 3 and the alkali washing tower 4 are respectively connected with an acid adjusting tank 15 and an alkali adjusting tank 16, the acid adjusting tank 15 is communicated with the acid washing tank 5 through a first electronic valve 17, the alkali adjusting tank 16 is communicated with the alkali washing tank 6 through a second electronic valve 18, and the first electronic valve 17 and the second electronic valve 18 are respectively connected to the PLC control system through an electric circuit. The acid adjusting tank 15 and the alkali adjusting tank 16 are respectively provided with an acid buffer solution (at least one of acetic acid buffer solution, citric acid buffer solution and phosphoric acid buffer solution) and an alkali buffer solution (sodium phosphate dibasic) with a mass fraction of 10%, and a hydrochloric acid solution with a mass fraction of 90% and a pH of 2-3 and a sodium hydroxide solution with a mass fraction of 90% and a pH of 12-13.

[0032] The acid washing tank 5 and the alkali washing tank 6 are respectively provided with a first electric contact liquid level meter 19 and a second electric contact liquid level meter 20, the spray device comprises a rotary spray head 21, the rotary spray head 21 is equipped with a spiral nozzle 22, and the acid washing tower 3 and the alkali washing tower 4 are further provided with an air flow distribution plate 23 and a wire mesh demister 24. The acid washing tank 5 and the alkali washing tank 6 are respectively connected to a crystal slurry tank 27 through a third electronic valve 25 and a fourth electronic valve 26, and the first electric contact liquid level meter 19, the second electric contact liquid level meter 20, the third electronic valve 25 and the fourth electronic valve 26 are electrically connected to the PLC control system.

[0033] The acid washing tower 3 and the alkali washing tower 4 are provided with manholes 28 on the side surfaces, and the acid washing tower 3 and the alkali washing tower 4 are provided with support rings 30, the support rings 30 are provided with net racks 31, the net racks 31 are fixedly provided with packing layers 29, and the packing layers 29 are composed of a plurality of polytetrafluoroethylene cloth bags 32. Each polytetrafluoroethylene cloth bag 32 is independently provided with a ring handle 33 in interference fit with the net rack 31, and the ring handle 33 is provided with an opening 34 facilitating holding. The outer edges of the net racks 31 are fixedly provided with pulleys 35 downward, and the support rings 30 are provided with sliding grooves 36 matched with the pulleys 35.

[0034] Working principle:

[0035] The gas containing pollutants is collected by the gas collecting hood and enters the system through the gas inlet pipe. The induced draft fan ensures that the gas can smoothly pass through the acid washing tower and the alkali washing tower at a wind speed of 14000m³ / h. The gas first enters the acid washing tower, and the spraying device installed in the tower sprays the acid solution, which chemically reacts with the alkaline pollutants in the gas to achieve preliminary purification. The acid washing tank serves as a storage and circulation unit for the acid solution, which is circulated to the spraying device at the top of the acid washing tower through the first circulation pipeline and the first circulation pump. The first online pH detector monitors the pH value of the solution in the acid washing tank in real time, ensuring that the acid conditions are suitable to maintain efficient chemical reactions. The first gas concentration sensor detects the concentration of the gas discharged at the top of the acid washing tower, which is fed back to the PLC control system for adjusting the spraying amount and supplementing the solution in the acid washing tank. The gas after acid washing then enters the alkali washing tower, and similar to the acid washing tower, the second online pH detector monitors the pH value of the solution in the alkali washing tank to ensure that the alkaline conditions are suitable to complete the purification process. The PLC control system automatically adjusts the flow of the circulation pump based on the data fed back by the pH detectors and the gas concentration sensor to dynamically control the spraying amount of the spraying device, ensuring the efficiency and stability of the entire washing process. The gas after acid and alkali spraying and washing is discharged to the atmosphere through the exhaust pipe to ensure that the discharged gas meets environmental protection standards.

[0036] The PLC control system automatically adjusts the opening of the first and second electronic valves based on the real-time data of the first and second online pH detectors to accurately control the addition amount of the acid buffer solution, hydrochloric acid solution, alkaline buffer solution and sodium hydroxide solution, so as to maintain the pH value of the solution in the acid washing tank and the alkali washing tank at the optimal reaction condition. The acid washing tank and the alkali washing tank are respectively provided with a first electric contact type liquid level meter and a second electric contact type liquid level meter for real-time monitoring of the liquid level of the solution. When the solution in the acid and alkali absorption tank is circulated for a period of time, the PLC control system will control the opening and closing of the third and fourth electronic valves to supplement the turbid liquid to the crystal slurry tank for neutralization and salting. The crystal slurry tank can also be connected to a centrifugal desalting unit, a multi-effect evaporation device, etc. to package and recover salt substances.

[0037] The spraying device adopts a rotary nozzle equipped with a spiral nozzle to ensure uniform distribution of the solution, increase the contact area with the gas, and enhance the chemical reaction efficiency. The use of the rotary nozzle can reduce the risk of nozzle blockage, while the spiral nozzle can produce smaller droplets, increase the gas-liquid contact area, and improve the washing effect. The packing layer is composed of multiple corrosion-resistant polytetrafluoroethylene cloth bags, and the cloth bags are filled with activated carbon with a large surface area, which can increase the contact area between the gas and the washing liquid and improve the reaction efficiency. The ring handle and the net frame are in interference fit to ensure the stability and sealing of the cloth bag during use. The opening is convenient for the operator to hold, and the design of the pulley and the sliding groove allows the net frame to slide on the supporting ring to adjust the direction, making it easy for the operator to install and replace the cloth bag from the maintenance door, improving the maintenance efficiency.

[0038] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. An automated acid-alkali spray washing device, comprising an air inlet pipe, an induced draft fan installed on the air inlet pipe, the air inlet pipe being sequentially connected to an acid washing tower and an alkali washing tower, and a spray device installed at the top of the acid washing tower and the alkali washing tower, characterized in that: The bottom of the pickling tower is equipped with a pickling tank, and a first online pH meter is installed in the pickling tank. The pickling tank is connected to the spray device at the top of the pickling tower through a first circulation pipeline and a first circulation pump. A first gas concentration sensor is installed at the top of the pickling tower. The bottom of the alkaline washing tower is equipped with an alkaline washing tank, and a second online pH meter is installed in the alkaline washing tank. The alkaline washing tank is connected to the spray device at the top of the alkaline washing tower through a second circulation pipeline and a second pressurizing pump. A second gas concentration sensor and an exhaust pipe are installed at the top of the alkaline washing tower. The first circulating pump, the second circulating pump, the first online pH meter, the second online pH meter, the first gas concentration sensor, and the second gas concentration sensor are all electrically connected to the PLC control system.

2. The automated acid-alkali spray washing device according to claim 1, characterized in that: The pickling tank and the alkaline washing tank are also equipped with a first electric contact level gauge and a second electric contact level gauge, respectively. Both the first electric contact level gauge and the second electric contact level gauge are electrically connected to the PLC control system.

3. The automated acid-alkali spray washing device according to claim 1 or 2, characterized in that: The acid washing tower and the alkali washing tower are respectively connected to an acid-adjusting storage tank and an alkali-adjusting storage tank. The acid-adjusting storage tank is connected to the acid washing tank through a first electronic valve, and the alkali-adjusting storage tank is connected to the alkali washing tank through a second electronic valve. Both the first electronic valve and the second electronic valve are electrically connected to the PLC control system.

4. The automated acid-alkali spray washing device according to claim 3, characterized in that: The acid-adjusting storage tank and the alkali-adjusting storage tank are respectively filled with acidic buffer solution and alkaline buffer solution.

5. The automated acid-alkali spray washing device according to claim 1, characterized in that: The spraying device includes a rotating nozzle, which is equipped with a spiral nozzle. The acid washing tower and the alkali washing tower are equipped with an airflow distribution plate and a wire mesh demister.

6. The automated acid-alkali spray washing device according to claim 1, characterized in that: The pickling tank and the alkaline washing tank are respectively connected to the crystal slurry tank via a third electronic valve and a fourth electronic valve, and the third electronic valve and the fourth electronic valve are electrically connected to the PLC control system.

7. The automated acid-alkali spray washing device according to claim 1, characterized in that: The acid washing tower and the alkali washing tower are provided with maintenance doors on their sides, and the acid washing tower and the alkali washing tower are provided with a packing layer inside, which is filled with activated carbon.

8. The automated acid-alkali spray washing device according to claim 7, characterized in that: The acid washing tower and the alkali washing tower are equipped with support rings, and the support rings are equipped with a grid frame, and the packing layer is disposed on the grid frame.

9. The automated acid-alkali spray washing device according to claim 8, characterized in that: The filler layer is composed of multiple polytetrafluoroethylene (PTFE) bags, each of which is independently provided with a ring handle that is interference-fitted with the mesh frame, and the ring handle is provided with an opening for easy gripping.

10. The automated acid-base spray washing device according to claim 8 or 9, characterized in that: The outer edge of the grid frame is fixedly provided with pulleys pointing downwards, and the support ring is provided with a groove adapted to the pulleys.

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