CN216367355U

CN216367355U - A processing apparatus that is arranged in PAN base carbon fiber manufacturing procedure to contain cyanogen waste gas

Info

Publication number: CN216367355U
Application number: CN202120748654.8U
Authority: CN
Inventors: 朱慧宁; 周阳; 邱会东; 夏小忠
Original assignee: SUZHOU AITESI ENVIRONMENTAL PROTECTION EQUIPMENT CO Ltd
Current assignee: SUZHOU AITESI ENVIRONMENTAL PROTECTION EQUIPMENT CO Ltd
Priority date: 2021-04-13
Filing date: 2021-04-13
Publication date: 2022-04-26
Anticipated expiration: 2031-04-13

Abstract

The utility model provides a treatment device for cyanogen-containing waste gas in a PAN-based carbon fiber manufacturing process, which comprises an air inlet, an air outlet and a treatment device connected with the air inlet and the air outlet, wherein an induced draft fan is arranged between the air inlet and the treatment device, and the treatment device comprises a cooling and dedusting tower group, an oxidation absorption tower, an adsorption tower and an exhaust fan which are sequentially connected according to the air flow conveying direction; the treatment device also comprises a waste liquid temporary storage tank connected with the cooling and dust removal tower set. The utility model discloses a cyanide-containing waste gas treatment device with sufficient adsorption reaction for a PAN-based carbon fiber manufacturing process.

Description

A processing apparatus that is arranged in PAN base carbon fiber manufacturing procedure to contain cyanogen waste gas

Technical Field

The utility model relates to the field of purification treatment, in particular to a treatment device for cyanogen-containing waste gas in a PAN-based carbon fiber manufacturing process.

Background

In recent years, with the rapid development of economy in China, polyacrylonitrile carbon fiber is applied to the fields of national defense, aerospace, sports and the like as one of high-tech novel materials.

During the production and processing processes of carbon fiber preoxidation, high-temperature oxidation and the like by polyacrylonitrile protofilament, because the polyacrylonitrile protofilament generates cyclization, crosslinking and polycondensation reactions among molecules and in molecules, a disordered graphite structure layer is formed, and then toxic and harmful gases such as HCN, NH3, CO and the like with high concentration can be generated, thereby causing great harm to the mind and body of workers and the environment around workshops. Especially, the concentration and toxicity of waste gas HCN are the strongest, so that the removal of HCN is very important. The conventional treatment methods are catalytic combustion, adsorption and absorption. The catalytic combustion is to convert the cyanogen-containing waste gas into CO2, H20 and N2 after the cyanogen-containing waste gas and corresponding oxygen are mixed and combusted in the presence of a specific catalyst, but the catalytic combustion has higher requirements on the selectivity of the catalyst, and a combustion method needs to consume a lot of fuel under the condition of low HCN concentration, so that the catalytic combustion is not economical and has high investment cost; the adsorption method is characterized in that waste gas is discharged after being adsorbed by activated carbon filled with activated carbon or diatomite, the method is used for adsorbing the waste gas with higher concentration and needs to be provided with a desorption device and an incineration system, if the waste gas is absorbed at one time, more dangerous wastes can be generated, the waste of resources can be caused, and the operation cost is higher. And the conventional absorption and adsorption device directly enters the adsorption tower for adsorption after absorption, so that the waste gas with nearly saturated humidity from the absorption tower enters the adsorption tower for adsorption, the water in the waste gas and the waste gas containing cyanogen compete for adsorption, and the effect of adsorbing HCN is not good.

SUMMERY OF THE UTILITY MODEL

The utility model overcomes the defects of the prior art and provides a treatment device for cyanogen-containing waste gas in the PAN-based carbon fiber manufacturing process, which has sufficient adsorption reaction.

In order to achieve the purpose, the utility model adopts the technical scheme that: a processing device for cyanogen-containing waste gas in a PAN-based carbon fiber manufacturing procedure comprises a gas inlet, a gas outlet and a processing device connected with the gas inlet and the gas outlet, wherein a draught fan is arranged between the gas inlet and the processing device, and the processing device comprises a cooling and dedusting tower group, an oxidation absorption tower, an adsorption tower and an exhaust fan which are sequentially connected according to the air flow conveying direction; the treatment device also comprises a waste liquid temporary storage tank connected with the cooling and dust removal tower set.

In a preferred embodiment of the utility model, a waste gas heater is arranged between the oxidation absorption tower and the adsorption tower.

In a preferred embodiment of the present invention, the exhaust port six of the exhaust fan is further connected with a flue gas reheater.

In a preferred embodiment of the utility model, the exhaust port seven of the flue gas reheater is connected with the exhaust funnel through a guide pipe.

In a preferred embodiment of the utility model, the cooling and dust removing tower set comprises a plurality of tower bodies, the bottoms of the tower bodies are connected with a circulating water tank, and the circulating water tank is connected with the waste liquid temporary storage tank; the air inlet introduces waste gas into the tower body through the induced draft fan, a spraying system is arranged in the tower body.

In a preferred embodiment of the utility model, a plurality of spraying layers which are arranged at intervals are sequentially arranged in the oxidation absorption tower according to the airflow transmission direction, and a plurality of packing layers or/and a plurality of demisters are sequentially arranged between the spraying layers according to the airflow transmission direction.

In a preferred embodiment of the utility model, the bottom of the oxidation absorption tower is provided with a plurality of internal circulation water tank systems.

In a preferred embodiment of the utility model, a plurality of internal circulation water tank systems, a first packing layer, a first spraying layer, a liquid receiving disc, a second packing layer, a second spraying layer, a lower layer folded plate demister and an upper layer wire mesh demister are sequentially arranged in the oxidation absorption tower from bottom to top.

In a preferred embodiment of the utility model, two sides of the adsorption tower are respectively provided with a gas inlet five connected with a gas outlet four of the oxidation absorption tower and a gas outlet five connected with a gas exhaust fan; be provided with UV photodissociation district and active carbon district in the adsorption tower, and UV photodissociation district and active carbon position in go into gas port five with between the gas vent five.

In a preferred embodiment of the present invention, the treatment apparatus further comprises a feeding system, wherein the feeding system comprises lye supply pipes respectively connected with the oxidation absorption tower; and an oxidant supply pipe connected with the oxidation absorption tower and the waste liquid temporary storage tank respectively.

The utility model solves the defects existing in the technical background, and has the beneficial technical effects that:

firstly, introduce cooling and dust removal tower system with waste gas through the draught fan and cool down the dust removal, then will realize the purification treatment through liquid medicine alkali lye and the oxidant of adhesion on first packing layer and the first packing layer in proper order in the leading-in oxidation absorption tower of waste gas that the cooling was removed dust, then the defogging operation is realized to lower floor folded plate defroster and upper wire net defroster of rethread.

And secondly, the waste gas is output to an exhaust funnel through a waste gas heater, an adsorption tower and a flue gas reheater, the treated waste gas is discharged from an air outlet of the exhaust funnel, or the waste gas is output to the exhaust funnel after being reheated and whitened by the flue gas reheater, and the treated waste gas is discharged from an air outlet of the exhaust funnel.

And thirdly, the collection of waste liquid is realized in the treatment process, the liquid is recycled in the cooling and dust removing tower group and the oxidation absorption tower, and the purification efficiency and the full utilization rate of liquid medicine or water resources are improved.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural diagram of a cyanide-containing waste gas treatment device used in a PAN-based carbon fiber manufacturing process according to a preferred embodiment of the utility model;

FIG. 2 is a schematic view showing the structure of an adsorption column in a preferred embodiment of the present invention;

FIG. 3 is an enlarged schematic view of portion A of FIG. 1 in accordance with a preferred embodiment of the present invention;

the meaning of the reference symbols in the figures: 1-a draught fan, 2-a cooling and dedusting tower set, 21-a tower I, 211-a spray system unified, 22-a tower II, 221-a spray system II, 23-a circulating water tank, 24-a circulating water pump I, 25-a circulating pipeline I, 3-an oxidation absorption tower, 31-an internal circulating water tank system unified, 311-a circulating water pump II, 312-a circulating pipeline II, 313-a return pipe II, 32-an internal circulating water tank system II, 321-a circulating water pump III, 322-a circulating pipeline III, 323-a return pipe III, 33-a first packing layer, 34-a first spray layer, 35-a liquid receiving disc, 36-a second packing layer, 37-a second spray layer, 38-a lower layer folded plate, 39-an upper layer wire mesh demister, a-a first air inlet, b-a second air inlet, 4-a waste gas heater, 5-an adsorption tower, 51-a UV photolysis zone, 52-an active carbon zone, 53-a primary filter screen, 54-a spray system III, 6-an exhaust fan, 7-a flue gas reheater, 8-an exhaust funnel, 9-a draft tube, 10-a waste liquid temporary storage tank, A1-an alkali liquor supply pipe, A2-an oxidant supply pipe I, A3-an oxidant supply pipe II, A4-a steam supply pipe, A5-a steam return pipe, A6-a water supply pipe, an A7-an air outlet, 101-a liquid discharge pipe I, 102-a liquid discharge pipe II and 103-a liquid discharge pipe III.

Detailed Description

The utility model will now be described in further detail with reference to the accompanying drawings and examples, which are simplified schematic drawings and illustrate only the basic structure of the utility model in a schematic manner, and thus show only the constituents relevant to the utility model.

It should be noted that, if directional indications (such as up, down, bottom, top, etc.) are involved in the embodiment of the present invention, the directional indications are only used for explaining the relative position relationship, motion situation, etc. of each component in a certain posture, and if the certain posture is changed, the directional indications are changed accordingly. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are intended to be inclusive and mean, for example, that there may be a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 3, a device for treating cyanide-containing waste gas in a PAN-based carbon fiber manufacturing process comprises an air inlet, an air outlet a7, and a treatment device connected with the air inlet and the air outlet a7, wherein an induced draft fan 1 is arranged between the air inlet and the treatment device, and the treatment device comprises a cooling and dedusting tower group 2, an oxidation absorption tower 3, an adsorption tower 5, and an exhaust fan 6 which are sequentially connected according to an air flow transmission direction; the treatment device also comprises a waste liquid temporary storage tank 10 connected with the cooling and dust removal tower group 2. And a sixth exhaust port of the exhaust fan 6 is also connected with a flue gas reheater 7. An air outlet seventh of the flue gas reheater 7 is connected with an exhaust funnel 8 through a guide pipe 9. The treatment device also comprises a feeding system, and the feeding system comprises an alkali liquor supply pipe A1 respectively connected with the oxidation absorption tower 3; and an oxidant supply pipe A2 and an oxidant supply pipe B A3 connected to the oxidation absorption tower 3 and the waste liquid temporary storage tank 10, respectively.

Specifically, the cooling and dust removing tower group 2 adopts a venturi cooling and dust removing tower. The cooling and dust removing tower set 2 comprises a first tower body 21 and a second tower body 22 which are arranged in parallel, the bottoms of the first tower body 21 and the second tower body 22 are respectively connected with a circulating water tank 23, the circulating water tank 23 is connected with a waste liquid temporary storage tank 10, an air inlet can introduce waste gas into the first tower body 21 or the second tower body 22 or the first tower body 21 and the second tower body 22 through an induced draft fan 1, and a first spraying system 211 and a second spraying system 221 are respectively arranged in the first tower body 21 and the second tower body 22. The alkaline oxidation circulating liquid in the circulating water tank 23 is pumped by the first circulating water pump 24 and the first circulating pipeline 25 and then is supplied to the first spraying system 211 and the second spraying system 221 for spraying, so that the circulating oxidation absorption is realized. Meanwhile, the main water replenishing source after sewage discharge is to replenish water to the circulating water tank 23 through an external water supply pipe A6, and the water intake ports of the first circulating water pump 24 and the first circulating pipeline 25 are as close as possible to the water intake port of the external water supply pipe A6. And the main waste water in the circulating water tank 23 is introduced into the waste liquid temporary storage tank 10 through the first drainage pipeline 101. The exhaust port of the cooling and dust removing tower set 2 above the circulating water tank 23 can be connected with the oxidation absorption tower 3 through the first air inlet a or the second air inlet b, and the automatic switching of the first-stage oxidation absorption and the second-stage oxidation absorption can be realized through the electric valves on the corresponding pipelines according to the concentration of the waste gas. Or used for the overhaul and maintenance of the lower end of the oxidation absorption tower.

Specifically, a plurality of spray layers arranged at intervals are sequentially arranged in the oxidation absorption tower 3 according to the air flow transmission direction, and a plurality of packing layers and a plurality of demisters are sequentially arranged between the spray layers according to the air flow transmission direction. The bottom of the oxidation absorption tower 3 is provided with a plurality of internal circulation water tank 23 systems. More specifically, an inner pair of internal circulation water tank system 31, an inner circulation water tank system two 32, a first packing layer 33, a first spraying layer 34, a liquid receiving disc 35, a second packing layer 36, a second spraying layer 37, a lower layer folded plate demister 38 and an upper layer wire mesh demister 39 are sequentially arranged in the oxidation absorption tower 3 from bottom to top, and a fourth exhaust port connected with the absorption tower 5 is arranged at the top of the oxidation absorption tower 3.

Furthermore, a partition plate is arranged in the internal circulation water tank. The water tank is divided into two parts, namely an internal circulation water tank 31 and an internal circulation water tank 31.

Furthermore, a plurality of paths of alkali liquor supply pipe A1 and oxidant supply pipe A2 of the feeding system are respectively led out to feed the internal circulation water tank system 31 and the internal circulation water tank system II 32, and the upper parts of the internal circulation water tank A and the internal circulation water tank II in the oxidation absorption tower 3 are connected with the water supply pipe A6 through water replenishing pipelines to realize water replenishing operation of the internal circulation water tank system 31 and the internal circulation water tank system II 32. The bottoms of the first internal circulation water tank 31 and the second internal circulation water tank 32 are respectively connected with a second circulating water pump 311 and a third circulating water pump 321, liquid is guided into the first spraying layer 34 through the connection of the second circulating water pump 311 and the second circulating pipeline 312, the spraying operation on the first packing layer 33 is realized, and the waste gas fully and reversely contacts with the circulating liquid sprayed on the first packing layer 33 when passing through the first packing layer 33 from top to bottom to realize purification treatment; through the connection of circulating water pump three 321 and circulation pipeline three 322, with the leading-in two way second that set up in parallel at interval of liquid spray layer 37, realize respectively the operation of spraying second packing layer 36 and lower floor's folded plate defroster 38, waste gas is abundant counter current contact realization purification treatment once more and defogging processing with the circulating liquid that second packing layer 36 and lower floor's folded plate defroster 38 top sprayed when passing through second packing layer 36, lower floor's folded plate defroster 38 in proper order. A liquid receiving disc 35 which can allow air flow to pass through is arranged in a space between the first packing layer 33 and the second packing layer 36, a liquid guide groove connected with the second internal circulation water tank is arranged on one side of the liquid receiving disc 35, and waste liquid is introduced into the second internal circulation water tank through the liquid guide groove. And waste liquid is introduced into the waste liquid temporary storage tank 10 from the bottoms of the internal circulation water tank I and the internal circulation water tank II through a liquid discharge pipeline II 102 and a liquid discharge pipeline III 103 respectively, and is uniformly discharged into the next working procedure or discharged from the waste liquid temporary storage tank 10.

Furthermore, the liquid receiving plate 35 includes a partition plate embedded in the oxidation absorption tower 3, a plurality of air ducts protruding upward are disposed on the partition plate, an air outlet at the upper portion of the air duct is higher than the upper surface of the partition plate, a plurality of supporting ribs disposed at intervals are disposed at the upper portion of the air duct, and a cover body of an umbrella structure covering the air duct is disposed on the supporting ribs.

Specifically, two sides of the adsorption tower 5 are respectively provided with a gas inlet five connected with a gas outlet four of the oxidation absorption tower 3 and a gas outlet five connected with a gas exhaust fan 6; the adsorption tower 5 is provided with a UV photolysis region 51 and an activated carbon region 52 therein, and the UV photolysis region 51 and the activated carbon region 52 are located between the gas inlet five and the gas outlet five. An exhaust gas heater 4 is also arranged between the oxidation absorption tower 3 and the adsorption tower 5. A pressure detector or/and a flowmeter or/and a valve can be arranged on a pipeline for transmitting liquid or/and gas or gas-liquid mixture, thereby realizing the control of pressure, flow and on-off. Adsorption tower 5 is reserved for adsorbing, can fill absorbent such as active carbon or diatomaceous earth in adsorption tower 5, can high-efficiently get rid of and contain cyanogen waste gas and NH3 and VOCs waste gas, satisfy the environmental protection requirement. The device for efficiently purifying the high-temperature cyanogen-containing and dust-containing waste gas is simple to operate, convenient to maintain and overhaul, good in economical efficiency, low in operation cost and high in practicability.

Specifically, the exhaust port four at the top of the oxidation absorption tower 3 can be connected with the flue gas reheater 7 through the exhaust fan 6 after passing through the waste gas heater 4 and the adsorption tower 5, and can also be directly connected with the flue gas reheater 7 through the exhaust fan 6. The input ends of the flue gas reheater 7 are respectively used for introducing the adsorbed waste gas, the other input end of the flue gas reheater 7 is connected with a steam supply pipe A4 to introduce steam, and the output end of the flue gas reheater 7 is connected with a steam return pipe A5 to discharge the used steam. The exhaust gas reheated by the flue gas reheater 7 is introduced into the exhaust stack 8, and finally, the treated exhaust gas is discharged from the outlet a7 through the exhaust stack 8.

The working principle of the utility model is as follows:

as shown in fig. 1 to 3, firstly, the waste gas is introduced into a cooling and dedusting tower set 2 through an induced draft fan 1 to cool and dedust, then the cooled and dedusted waste gas is introduced into an oxidation absorption tower 3 to sequentially pass through a first packing layer 33 and liquid medicine alkali liquor and an oxidizing agent adhered to the first packing layer 33 to realize purification treatment, and then demisting operation is realized through a lower layer folded plate demister 38 and an upper layer wire mesh demister 39. Then the waste gas is output to an exhaust funnel 8 through a waste gas heater 4, an adsorption tower 5 and a flue gas reheater 7, and the treated waste gas is discharged from a gas outlet A7 of the exhaust funnel 8, or the waste gas is output to the exhaust funnel 8 through the flue gas reheater 7 and then the treated waste gas is discharged from a gas outlet A7 of the exhaust funnel 8.

The collection of waste liquid is realized in the process of treatment, the liquid is recycled in the cooling and dust removing tower group 2 and the oxidation absorption tower 3, and the purification efficiency and the full utilization rate of liquid medicine or water resources are improved.

Specifically, high-temperature, dust-containing and cyanogen-containing waste gas sucked by the draught fan 1 enters the cooling and dust removing tower 2, and the humidity is saturated after the cooling and dust removing tower 2 cools and removes dust. The circulating liquid pumped by the first circulating water pump 24 can be uniformly distributed on the whole cross section of the throats of the first tower 21 and the second tower 22, and the absorption liquid sprayed into the throats can form a plurality of small droplets after atomization, so that the contact area of the liquid and the gas is increased, the heat transfer, temperature reduction and dust removal efficiency of high-temperature, cyanogen-containing and dust-containing waste gas in the temperature reduction and dust removal tower 2 is improved, and the oxidation absorption of the cyanogen-containing waste gas by the oxidation absorption tower 3 at the rear end is ensured. The cooling and dust removing tower 2 can form a negative pressure environment while cooling and removing dust, so that high-temperature, cyanogen-containing and dust-containing waste gas in the polyacrylonitrile carbon fiber manufacturing process can enter the corresponding cooling and dust removing tower 2 along the pipeline direction, and the pollution to the surrounding environment and the damage to a human body caused by the dissipation of the waste gas into the air are avoided; meanwhile, the energy consumption of the front-end induced draft fan can be reduced. The inlets at the upper ends of the first tower 21 and the second tower 22 are respectively provided with a first electric valve and a second electric valve, and the dust removal and temperature reduction conditions of the first tower 21 and the second tower 22 and the size of the air inlet volume can be automatically switched according to the inlet temperature and the dust concentration of the waste gas. The number of the first tower 21 and the second tower 22 is controlled, so that the energy consumption is reduced as much as possible while the dust removal, cooling, absorption efficiency and air suction effect are improved. The cyanogen-containing waste gas with saturated humidity enters the oxidation absorption tower 3 after being cooled and dedusted by the dedusting tower 2.

The oxidation absorption tower 3 is divided into an upper oxidation absorption section and a lower oxidation absorption section. And a third circulating water pump 311 for pumping the circulating spray liquid of the internal circulating water tank system 31 of the oxidation absorption tower 3, and an outlet of the third circulating water pump is connected with one end of the second circulating pipeline 312. The second circulation pipeline 312 is respectively provided with a first spraying layer 34 and a second return pipe 313 which are used for the lower section oxidation absorption of the oxidation absorption tower 3, and the first spraying layer 34 is used for the first-stage oxidation absorption of the oxidation absorption tower 3 on the cyanogen-containing waste gas from the cooling and dust removal tower 2 after cooling and dust removal. With the configuration of the lower section oxidation absorption, an inlet of the third circulating water pump 321 is connected with an outlet at the bottom of the second internal circulating water tank system through a flange, and an outlet of the third circulating water pump 321 is connected with one end of a third circulating pipeline 322. The third circulating pipeline 322 is respectively provided with a second spraying layer 37 and a third return pipe 323 which are used for the upper oxidation absorption of the oxidation absorption tower 3, and the second spraying layer 37 is used for the secondary oxidation absorption of the cyanogen-containing waste gas from the next oxidation absorption by the spraying of the second packing layer 36. The second return pipe 313 and the third return pipe 323 are respectively provided with a pH meter, a conductivity meter and an ORP meter, and are used for online monitoring of a pH value, a conductivity value and an ORP value, controlling the dosing amount of the alkali liquor and the hydrogen peroxide and maintaining the oxidizability of the circulating liquid under an alkaline condition, thereby ensuring that the oxidation absorption tower 3 can efficiently and stably absorb the cyanogen-containing waste gas. A liquid receiving disc 35 is arranged above a first spraying layer 34 of the oxidation absorption tower 3 and used for guiding the circulating liquid of the upper-layer second-stage oxidation absorption section into the inner circulating water tank system II 32 to realize the circulating oxidation absorption of the upper-layer second-stage oxidation absorption section, meanwhile, the second-stage circulating liquid does not flow into the lower-layer first-stage oxidation absorption tower to realize the two-stage absorption of one tower, so that the uniform gas-liquid distribution of the upper-layer second-stage oxidation absorption tower can be ensured, the sufficient oxidation absorption can be realized, and the space can be saved. The oxidation absorption tower 3 adopts a packed tower, and the first packing layer 33 and the second packing layer 36 are filled with packing with excellent performance, so that the gas-liquid contact area can be increased, and the mass transfer absorption of the cyanogen-containing waste gas is facilitated. The oxidation absorption tower 3 left side sets up first air inlet a and second air inlet b, and be equipped with corresponding solenoid valve on first air inlet a and the second air inlet b respectively, 31 need clear up when the inner loop water tank system, maintain or first packing layer 33 needs clear up, when changing or pollutant concentration is lower, one-level oxidation is absorbed when just can reaching the emission requirement, but the valve of first air inlet a self-closing second air inlet b's valve is automatic to be opened simultaneously, make cyanogen waste gas follow second air inlet b and get into the upper segment and carry out the oxidation absorption, realize online operation and do not influence the treatment effect of waste gas, satisfy the environmental protection requirement.

After the temperature reduction and the dust removal by the dust removal tower 2, the cyanogen-containing waste gas with saturated humidity enters the oxidation absorption tower 3, enters the first packing layer 33 of the oxidation absorption tower 3 from the first inlet a at the lower part of the oxidation absorption tower 3, and is in full countercurrent contact with the circulating spray liquid from top to bottom for oxidation absorption. The low-concentration cyanogen-containing waste gas after the first-stage oxidation absorption of the lower section continuously moves upwards to enter a second packing layer 36 to be in countercurrent contact with the circulating absorption liquid from top to bottom for secondary oxidation absorption, then enters a lower layer folded plate demister 38 on the upper part, and enters an upper layer wire mesh demister 39 after being trapped by the mist demister to trap mist droplets with smaller particle sizes again, so that acid mist and water mist are prevented from being entrained by the mist. Absorption liquid oxidized and absorbed by the first-stage packing layer 33 and the second packing layer 36 in the oxidation absorption tower 3 respectively flows into the internal circulation water tank system I31 and the internal circulation water tank system II 32 in the tower for cyclic oxidation absorption, and regular water replenishing and draining are needed to ensure continuous and stable absorption and prevent the packed tower from being blocked. Cyanide-containing sewage discharged from the oxidation absorption tower 3 can flow into a waste liquid temporary storage tank through a second circulating water pump 311 and a third circulating pipeline 322, and is discharged after cyanide-containing ions are detected to be qualified; if the waste water is not qualified, H2O2 or NaClO is added to oxidize and break cyanogen, and then the waste water is ensured to reach the standard and be discharged.

And the waste gas heater 4 and the adsorption tower 5 are connected in parallel on a pipeline between the outlet of the oxidation absorption tower 3 and the inlet of the exhaust fan 6 through pipelines. And a first electric valve is also arranged on the middle pipeline, and a second electric valve is arranged on the inlet pipeline of the waste gas heater 4 and is linked with the HCN on-line monitor. The cyanogen-containing waste gas oxidized and absorbed by the oxidation absorption tower 3 is monitored by an HCN online detector, and if the waste gas reaches the standard and is discharged, the waste gas is automatically started by a first electric valve for signal transmission, is introduced into a reheater 7 by an exhaust fan 6, is reheated and is discharged at high altitude by an exhaust funnel 8; otherwise, if the discharge standard is not met, the signal is transmitted, the second electric valve is automatically opened, the exhaust gas is heated and dehumidified by the exhaust gas heater 4, enters the adsorption tower to be adsorbed and reach the standard, is introduced into the reheater 7 by the exhaust fan 6, is reheated and is discharged in the high altitude by the exhaust funnel 8.

The above embodiments are specific supports for the idea of the present invention, and the protection scope of the present invention is not limited thereby, and any equivalent changes or equivalent modifications made on the basis of the technical scheme according to the technical idea of the present invention still belong to the protection scope of the technical scheme of the present invention.

Claims

1. A processing apparatus that is arranged in PAN base carbon fiber processing procedure to contain cyanogen waste gas, includes air inlet and gas outlet to and connect air inlet and gas outlet, its characterized in that: an induced draft fan is arranged between the air inlet and the treatment device, and the treatment device comprises a cooling and dedusting tower group, an oxidation absorption tower, an adsorption tower and an exhaust fan which are sequentially connected according to the air flow conveying direction; the treatment device also comprises a waste liquid temporary storage tank connected with the cooling and dust removal tower set.

2. The apparatus as claimed in claim 1, wherein the apparatus comprises: and a waste gas heater is also arranged between the oxidation absorption tower and the adsorption tower.

3. The apparatus as claimed in claim 2, wherein the apparatus comprises: and a sixth exhaust port of the exhaust fan is also connected with a flue gas reheater.

4. The apparatus as claimed in claim 3, wherein the apparatus comprises: and an air outlet seventh of the flue gas reheater is connected with the exhaust funnel through a guide pipe.

5. The apparatus as claimed in claim 4, wherein the apparatus comprises: the cooling and dedusting tower set comprises a plurality of tower bodies, the bottoms of the tower bodies are connected with a circulating water tank, and the circulating water tank is connected with the waste liquid temporary storage tank; the air inlet introduces waste gas into the tower body through the induced draft fan, a spraying system is arranged in the tower body.

6. The apparatus as claimed in claim 5, wherein the apparatus comprises: a plurality of layers of spraying layers which are arranged at intervals are sequentially arranged in the oxidation absorption tower according to the air flow transmission direction, and a plurality of packing layers or/and a plurality of layers of demisters are sequentially arranged between the spraying layers according to the air flow transmission direction.

7. The apparatus as claimed in claim 6, wherein the apparatus comprises: and a plurality of internal circulation water tank systems are arranged at the bottom of the oxidation absorption tower.

8. The apparatus of claim 7, wherein the apparatus comprises: a plurality of internal circulation water tank systems, a first packing layer, a first spraying layer, a liquid receiving disc, a second packing layer, a second spraying layer, a lower layer folded plate demister and an upper layer wire mesh demister are sequentially arranged in the oxidation absorption tower from bottom to top.

9. The apparatus of claim 8, wherein the apparatus comprises: an air inlet five connected with an air outlet four of the oxidation absorption tower and an air outlet five connected with an air exhaust fan are respectively arranged on two sides of the adsorption tower; be provided with UV photodissociation district and active carbon district in the adsorption tower, and UV photodissociation district and active carbon position in go into gas port five with between the gas vent five.

10. The apparatus of claim 9, wherein the apparatus comprises: the treatment device also comprises a feeding system, and the feeding system comprises alkali liquor supply pipes which are respectively connected with the oxidation absorption tower; and an oxidant supply pipe connected with the oxidation absorption tower and an oxidant supply pipe connected with the waste liquid temporary storage tank.