CN210729077U

CN210729077U - Nitrogen centralized desorption system for treating waste activated carbon containing VOCs

Info

Publication number: CN210729077U
Application number: CN201920755778.1U
Authority: CN
Inventors: 曾仁勇; 曾人宽; 吴应文
Original assignee: Shenzhen Zhidun Environmental Protection Technology Co ltd
Current assignee: Shenzhen Zhidun Environmental Protection Technology Co ltd
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2020-06-12
Anticipated expiration: 2029-05-23

Abstract

The utility model discloses a desorption system is concentrated to nitrogen gas for handling useless active carbon that contains VOCs, including filtration system, main fan, circulating fan, at least two sets of desorption case, at least two sets of absorption carbon tank, chimney, high temperature nitrogen gas supply device, condensate circulating system, tubulation condenser, vapour and liquid separator, surface cooler, liquid phase separation system, solvent recovery unit and waste water recovery device. The utility model discloses a this utility model can solve the great batch of enterprise in a flexible way and contain the various (granule, honeycomb, column etc.) active carbon of saturated VOCs, carry out the desorption with the useless active carbon of mill and handle, the active carbon of desorption regeneration of mill can drop into the treatment facility once more and use, the desorption cycle is short, retrieve in the lump when the active carbon adsorption material of regeneration mill by absorbent organic solvent, alleviate the economic burden and produce economic benefits of blowdown enterprise, avoid the enterprise in the saturated and unable big environmental predicament that satisfies the recovery of conventional recovery processing company throughput.

Description

Nitrogen centralized desorption system for treating waste activated carbon containing VOCs

Technical Field

The utility model relates to a VOCs exhaust-gas purification handles the field, especially relates to a desorption system is concentrated to nitrogen gas for handling useless active carbon that contains VOCs, and this system is used for handling the adsorption material that adsorbs to have VOCs (like useless active carbon), carries out desorption processing to adsorption material, makes useless adsorption material regenerate and drop into use once more.

Background

In China, Volatile Organic Compounds (VOCs) refer to organic compounds with saturated vapor pressure of more than 133.32Pa at normal temperature and boiling point of 50-260 ℃ below at normal pressure, or any organic solid or liquid capable of volatilizing at normal temperature and normal pressure. Due to the high volatility of organic solvents, most of the organic solvents are converted into VOCs and discharged into the air.

At present, most enterprises adopt a simple activated carbon particle adsorption process for treatment, and the replacement cost of activated carbon saturated in adsorption is high, and the difficulty that the treatment capacity of a conventional recovery treatment company is saturated and cannot meet the recovery in a large environment is solved. And due to the reasons that the number of enterprises is large and the enterprises are distributed and dispersed, the VOCs of the small and medium-sized enterprises are difficult to be stably discharged up to the standard, and the comprehensive improvement of the VOCs is difficult to promote. Through this utility model discloses can solve the enterprise in a small batch volume in a flexible way and contain the regeneration problem of the various (granule, honeycomb, column etc.) active carbon of saturated VOCs or other adsorbing materials (if can have active carbon, silica gel, molecular sieve, zeolite etc. as the adsorbing material of purifying waste gas), practice thrift the cost for the enterprise.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned prior art not enough and provide a nitrogen gas concentration desorption system for handling useless active carbon that contains VOCs, through this utility model discloses can solve the great batch of enterprise in a flexible way and contain the various (granule, honeycomb, column etc.) active carbon of saturated VOCs, carry out desorption treatment with the useless active carbon of mill, the active carbon of mill desorption regeneration can drop into treatment facility once more and use, the desorption cycle is short, retrieve in the lump by absorbent organic solvent during the active carbon adsorption material of regeneration mill, alleviate the economic burden of blowdown enterprise and produce economic benefits, avoid the enterprise in the saturated and unable predicament under the big environment that satisfies the recovery of conventional recovery processing company handling capacity. The project model has huge market potential and provides a new way for VOCs treatment. The dilemma that the conventional recovery processing company has saturated treatment capacity and cannot meet the large environment of recovery is solved.

In order to achieve the purpose, the utility model provides a nitrogen gas centralized desorption system for processing VOCs-containing waste activated carbon, which comprises a filtering system, a main fan, a circulating fan, at least two groups of desorption boxes, at least two groups of adsorption carbon tanks, a chimney, a high-temperature nitrogen gas supply device, a condensed water circulating system, a tubular condenser, a gas-liquid separator, a surface cooler, a liquid phase separation system, a solvent recovery device and a waste water recovery device; wherein, desorption incasement portion is equipped with and is used for placing useless active carbon accommodation space, high temperature nitrogen gas supply device respectively with desorption case, adsorb the carbon tank and communicate, desorption case respectively with the tubulation condenser, the spiral plate condenser communicates, the spiral plate condenser respectively with the vapour and liquid separator, desorption case, the surface cooler, the carbon tank communicates, the vapour and liquid separator respectively with main fan, the spiral plate condenser communicates, main fan and filtration system communicate, filtration system and surface cooler communicate, the surface cooler respectively with the spiral plate condenser, adsorb the carbon tank and communicate with tubulation condenser, the spiral plate condenser, the chimney respectively; the chimney is respectively communicated with the circulating fan and the desorption box which finishes desorption, and the desorption box which finishes desorption is communicated with the tube nest condenser; the spiral plate condenser is communicated with the liquid phase separator, and the liquid phase separation system is respectively communicated with the main fan, the solvent recovery device and the wastewater recovery device; the condensed water circulating system is respectively connected with the spiral plate condenser, the tube array condenser and the surface cooler to provide circulating cooling water; the number of desorption tanks may be increased or decreased according to the throughput. It should be noted that a plurality of desorption boxes constitute desorption box group, and a plurality of absorption carbon tanks constitute absorption carbon tank group. According to different treatment capacities, the integrated truck can be provided with a desorption tank group with a proper size, and when the size of the desorption tank group is increased (reduced), the size of the desorption tank group is increased (reduced).

Preferably, the desorption boxes are two groups, namely a desorption box A and a desorption box B, and the adsorption carbon tanks are two groups, namely an adsorption carbon tank A and an adsorption carbon tank B; the output end of the high-temperature nitrogen supply device is provided with a pressure reducing valve, the pressure reducing valve is communicated with four analytic inlet valves respectively, and each analytic inlet valve is communicated with a desorption box A, a desorption box B, an adsorption carbon tank A and an adsorption carbon tank B respectively.

Preferably, the liquid phase separation system comprises a layering tank, an aqueous layer tank and a solvent tank; the layering tank is communicated with the output end of the spiral plate condenser, the layering tank is respectively communicated with the water layer tank and the solvent tank, the water layer tank is communicated with the wastewater recovery device, and the solvent tank is communicated with the solvent recovery device; the output ends of the layering tank, the water layer tank and the solvent tank are also respectively communicated with the input end of the main fan.

Preferably, the water layer tank is communicated with the wastewater recovery device through a wastewater pump.

Preferably, the solvent tank is communicated with the solvent recovery device through a solvent pump.

Preferably, the condensed water circulating system comprises a condensed water upper water part, a circulating pipeline and a condensed water return part.

Preferably, an output end of the desorption box is communicated with the spiral plate condenser through a desorption valve.

Preferably, the first and second liquid crystal materials are,

the first input end of the desorption box is communicated with the output end of the high-temperature nitrogen supply device; the first output end of the desorption box is communicated with the input end of the spiral plate condenser; the second output end of the desorption box is communicated with the input end of the tube nest condenser;

the input end of the tube array condenser is communicated with the second output end of the desorption box; the output end of the tube nest condenser is communicated with the input end of the gas-liquid separator;

the input end of the gas-liquid separator is communicated with the output end of the tube nest condenser; the bottom output end of the gas-liquid separator is communicated with the spiral plate condenser, and the top output end of the gas-liquid separator is communicated with the input end of the main fan;

the first input end of the filtering system is connected with the output end of the main fan, and the output end of the filtering system is communicated with the first input end of the surface air cooler;

the first input end of the surface cooler is communicated with the output end of the filtering system; the surface cooler is connected with a condensed water circulating system; the first output end of the surface cooler is communicated with the input end of the spiral plate condenser; the second output end of the surface cooler is communicated with the first input end of the adsorption carbon tank; adsorption carbon tank

The first input end of the adsorption carbon tank is communicated with the second output end of the surface cooler through an air inlet valve, and the second input end of the adsorption carbon tank is communicated with the output end of the high-temperature nitrogen supply device; the first output end of the adsorption carbon tank is communicated with the chimney through an air outlet valve, the second output end of the adsorption carbon tank is communicated with the input end of the tube array condenser, and the third output end of the adsorption carbon tank is communicated with the input end of the spiral plate condenser; the adsorption carbon tank is connected with the circulating fan through an adsorption carbon tank bypass valve, and the circulating fan is communicated with the second input end of the desorption box through a drying valve; the input end of the spiral plate condenser is respectively communicated with the gas-liquid separator, the first output end of the desorption box, the first output end of the surface cooler and the third output end of the adsorption carbon tank, and the output end of the spiral plate condenser is communicated with the liquid phase separation system; the spiral plate condenser is connected with a condensed water circulating system;

the first input end of the liquid phase separation system is communicated with the spiral plate condenser, the first output end of the liquid phase separation system is communicated with the solvent recovery device through a solvent pump, the second output end of the liquid phase separation system is communicated with the wastewater recovery device through a wastewater pump, and the third output end positioned at the top of the liquid phase separation system is communicated with the input end of the main fan;

the first input end of the main fan is communicated with the top output end of the gas-liquid separator; the second input end of the main fan is communicated with the third output end at the top of the liquid phase separation system; the output end of the main fan is communicated with the first input end of the filtering system;

the condensed water circulating system is respectively connected with the spiral plate condenser, the tube array condenser and the surface cooler and provides circulating cooling water;

and the high-temperature nitrogen supply device is respectively communicated with the desorption box and the adsorption carbon tank through a pressure reducing valve.

Preferably, the liquid phase separation system comprises a layering tank, a water layer tank and a solvent tank, and the top output end of the layering tank, the top output end of the water layer tank and the top output end of the solvent tank are respectively connected with the second input end of the main fan.

The adsorption material can be used as the adsorption material for purifying waste gas, such as active carbon, silica gel, molecular sieve, zeolite, etc. That is, the desorption box of the utility model can treat the various adsorption materials (not only activated carbon) and can place various adsorption materials (not only activated carbon) in the adsorption carbon tank. The utility model discloses can be applicable to current various adsorbing material, have stronger commonality, suitability. Enterprise's user can select various adsorption material to handle the VOCs who discharges according to actual conditions, and saturated adsorption VOCs's useless adsorption material all can pass through the utility model discloses a desorption system is concentrated to nitrogen gas for handling contain VOCs's useless active carbon regenerates, and is more nimble.

The utility model discloses a concentrate desorption system can also be called and concentrate desorption station. Will concentrate desorption station fixed mounting subaerial, concentrate and handle useless active carbon.

The utility model has the advantages that:

1. through set up on-the-spot emission concentration monitoring instrument respectively at absorption carbon tank discharge port department, whether control emission concentration is up to standard, reach the absorption carbon tank that adsorbs saturation and stop adsorbing, adopt high temperature nitrogen desorption regeneration absorption carbon tank. The nitrogen desorption technology can meet the requirement of a stable solvent with the boiling point range of 40-250 ℃, and particularly has better regeneration effect after adsorption treatment of high-boiling-point nonvolatile organic matters. Meanwhile, the special desorption technology can reach very high desorption cleanliness, and the high efficiency and the discharge safety of the adsorption carbon tank are ensured. The regeneration adsorption carbon tank is connected with the desorption system through a desorption special interface. In the desorption process, the desorption circulating pipeline is an oxygen-free or low-oxygen closed system. When the desorption is carried out, the circulating fan is firstly started, high-temperature nitrogen is injected, and the high-temperature nitrogen is automatically adjusted to be injected until the air temperature at the inlet of the desorption box reaches the set temperature. And when the concentration of the desorbed gas solvent reaches a certain concentration after continuous accumulation, heat exchange and condensation are carried out to obtain a recovered solvent. The solvent in the desorption box is continuously desorbed and condensed by continuous heat supply of hot nitrogen. Set up at the surface cooler output and discharge concentration monitoring instrument, whether the control is discharged concentration and is up to standard, when the surface cooler output reaches very high desorption cleanliness, explain that desorption case desorption is accomplished, stop the heater heating, desorption incasement heat is consumed by the condenser, with desorption case cooling to safe temperature, take out and accomplish and lie in safe temperature active carbon after the desorption, put into desorption case with the active carbon that needs the desorption and carry out the desorption, will continue to carry out a desorption circulation. The desorption device is programmed by a PLC (programmable logic controller), full-automatic monitoring and control are carried out on the equipment, and a hard emergency stop button is arranged in the system. The control system has a screen monitoring function. The whole treatment system can automatically run circularly. The solvent recovered by the desorption box does not contain other impurities and is basically consistent with the purity of the material in the storage tank. In the case of incomplete nitrogen sealing, the recovered solvent will contain a small amount of water. The utility model discloses can the efficient handle organic waste gas, the treatment effeciency is high, the good reliability, and stability is high.

2. The application provides a centralized desorption system for the useless active carbon of desorption processing, especially contain the useless active carbon of organic matter, so-called organic matter is referred to VOCs in particular. The collected waste activated carbon used by the enterprise (factory) is put into one desorption box. Then introducing high-temperature nitrogen (high temperature) into the desorption box, wherein the high-temperature nitrogen plays a role of providing a heat source, the introduced high-temperature nitrogen is contacted with the waste activated carbon in the desorption box, the waste activated carbon is resolved under the heating action, a part of VOCs directly flows to the spiral plate condenser in a liquid form, and then enters a liquid phase separation system to separate the liquid into water and an organic solvent, and the water and the organic solvent are respectively treated; the other part of VOCs still exists in a gaseous state at high temperature, the gas enters a shell and tube condenser from a desorption box, then enters a gas-liquid separator from the tube nest condenser, the gas-liquid separator respectively outputs gas and liquid, wherein the liquid from the gas-liquid separator enters the spiral plate condenser and then enters the liquid phase separation system, the gas from the gas-liquid separator enters the main fan, the main fan plays a role of sucking the gas, then enters a filter from a main fan, then enters a surface cooler, the surface cooler outputs gas and liquid respectively, the liquid output from the surface cooler enters a spiral plate condenser, then sequentially enters a liquid phase separation system, the gas output from the surface cooler enters an adsorption carbon tank, activated carbon, such as granular activated carbon and honeycomb activated carbon, is placed in the adsorption carbon tank, and the adsorption treatment is carried out on the part of gas; the gas output from the adsorption carbon tank is the purified gas, and the emission treatment can be performed. The gas entering the adsorption carbon tank contains relatively small amount of VOCs, so that the desorption of a certain amount of waste activated carbon only needs to adsorb less activated carbon in the adsorption carbon tank. In addition, the gas output from the adsorption carbon tank is dry gas, and the temperature of the gas is low due to the cooling of the surface cooler, namely, the gas output from the adsorption carbon tank is dry gas which does not contain VOCs basically and has low temperature (the low temperature is relative to the desorption box heated by high-temperature nitrogen, and is a relative concept), and the gas can be used for cooling the other desorption box. That is to say, the utility model discloses in, set up two desorption casees, at same moment, a desorption case is used for the desorption to handle useless active carbon, and its institute is finally from some in the clean dry gas who adsorbs the carbon tank output introduced another desorption case again (this desorption case is not at the useless active carbon of desorption at present), just so can use the gas of treating the emission to cool off the desorption case. Moreover, the cooling effect is very good. The traditional way of cooling the desorption box (adsorption box) is to use a fan to introduce natural wind, but in a humid place, such as south China, the air water content is high, water drops can be formed in the desorption box when the desorption box is cooled by using the gas, which brings trouble to the next step of desorbing waste activated carbon, and if the steps of dehumidifying and dedusting natural wind are adopted, the energy is wasted, the cost is increased, and the environment is not green enough, two stations (two desorption boxes) are creatively designed in the application, clean and dry gas generated after the desorption box is cooled by desorption circulation is used for cooling the other desorption box to be cooled, so that the device is very energy-saving, environment-friendly and green and is very convenient; the waste gas utilization is achieved. This is also a very important light point of the present invention.

3. The user regularly sends the useless active carbon (or other adsorption materials) of saturation adsorption to concentrated desorption station and carries out regeneration treatment, has just so reduced whole waste gas treatment's cost, makes active carbon waste gas treatment can come into use in the society with lower cost, has certain impetus to green.

4. The activated carbon collected from the serviced business may be in various forms, either as bulk activated carbon granules or as specially shaped activated carbon treatment units. The desorption box of the utility model can treat the activated carbon. This has just increased the application range of the utility model, has increased the universality.

5. The activated carbon in the adsorption carbon tank slowly tends to be in a saturated adsorption state in the gradual use process. The utility model discloses can use high temperature nitrogen gas to carry out the desorption processing to the active carbon that adsorbs in the carbon tank. The utility model provides an adsorb the carbon tank and set two, handle the gas that comes from the surface cooler transmission and only use one of them to adsorb the carbon tank can. When one of the adsorption carbon tanks is saturated and adsorbed or is close to saturation, high-temperature nitrogen is introduced into the adsorption carbon tank, the waste activated carbon in the adsorption carbon tank is analyzed, liquid flows into the spiral condenser, gas directly enters the tubular condenser and then enters the gas-liquid separator, gas output from the gas-liquid separator enters the main fan, and liquid output from the gas-liquid separator enters the liquid phase separation system.

6. When the high-temperature nitrogen is introduced to carry out desorption treatment on the activated carbon in the desorption box and the adsorption carbon tank, the high-temperature nitrogen forms a circulation passage under the action of a circulating fan, and a certain amount of high-temperature nitrogen needs to be continuously supplemented in the circulation passage because a surface cooler and the like generate heat energy loss.

7. When industrial waste gas containing organic substances passes through the activated carbon bed layer, the organic substances in the industrial waste gas can be adsorbed and intercepted by the activated carbon, so that the waste gas is purified. The active carbon for adsorbing organic matters heats the active carbon bed layer by utilizing high-temperature nitrogen or hot air, provides heat for the organic matters adsorbed by the active carbon, improves the kinetic energy of the organic matters, gets rid of the constraint of an adsorbent, is released by blowing, and is discharged out of a desorption box. And after the desorption materials are subjected to heat exchange treatment by a condenser, condensing organic matters into liquid, and realizing organic solvent recovery. The utility model discloses can the efficient handle organic waste gas, the treatment effeciency is high, the good reliability, and stability is high.

8. In the earlier stage of desorption of the desorption box, a certain amount of air is discharged, and the gas cannot be condensed and needs to be separated from subsequent condensed liquid and returns to the front end of the device for re-adsorption and purification.

9. Surface cooler circulation clean system: and ensuring that the ambient air entering the adsorption carbon tank does not contain dust and impurities.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a nitrogen centralized desorption system for treating waste activated carbon containing VOCs according to the present invention; the arrows in fig. 1 are to indicate the direction of flow of the liquid or gas in the pipeline.

FIG. 2 is a schematic view of a nitrogen mass desorption system for treating spent activated carbon containing VOCs;

fig. 3 is a partial view of fig. 2.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1 to 3, the present invention provides a nitrogen centralized desorption system for treating waste activated carbon containing VOCs, which comprises a filtration system 20, a main blower 30, a circulating blower 43, a desorption tank a41, a desorption tank B42, two carbon adsorption tanks (carbon adsorption tank a and carbon adsorption tank B)70, a chimney 71, a high temperature nitrogen supply device 50, a condensed water circulation system 90, a tubular condenser 61, a spiral plate condenser 62, a gas-liquid separator 69, a surface cooler 60, a liquid phase separation system 801, a solvent recovery device 82 and a wastewater recovery device 81; the inside of the desorption boxes 41 and 42 is provided with a containing space for placing waste activated carbon, the high-temperature nitrogen supply device is respectively communicated with the desorption box and the adsorption carbon tank, the desorption box is respectively communicated with the tube array condenser and the spiral plate condenser 62, the spiral plate condenser is communicated with the gas-liquid separator, the gas-liquid separator is respectively communicated with the main fan and the spiral plate condenser, the main fan is communicated with the filtering system 20, the filtering system 20 is communicated with the surface air cooler 60, the surface air cooler is respectively communicated with the gas-liquid separator 69 and the adsorption carbon tank, and the adsorption carbon tank is respectively communicated with the tube array condenser, the spiral plate condenser 62 and the chimney; the spiral plate condenser is communicated with the liquid phase separator, and the liquid phase separation system 80 is respectively communicated with the main fan 30, the solvent recovery device 82 and the wastewater recovery device 81; the condensate circulating system 90 is connected with the spiral plate condenser, the tube nest condenser and the surface cooler respectively to provide circulating cooling water.

The following is further described with respect to each component, respectively:

two desorption tanks, referred to as desorption tanks a and B, respectively, take desorption tank a as an example: a first input end of the desorption box is communicated with an output end of the high-temperature nitrogen supply device through a pressure reducing valve (not shown) and analysis inlet valves 51 and 52; the first output end of the desorption box is communicated with the input end of the spiral plate condenser; the second output end of the desorption box is communicated with the input end of the tube nest condenser through

desorption valves

413 and 414; two desorption casees use in turn, only let in high temperature nitrogen gas to the desorption case of handling useless active carbon at present, do not handle the desorption case of useless active carbon and do not let in high temperature nitrogen gas to circulating fan lets in the desorption case of not handling the active carbon and adsorbs the part gas of treating emission after purifying to the carbon canister, cools off the desorption case of not handling the active carbon, in order to accelerate the cooling process, the raising the efficiency of desorption case.

A shell and tube condenser 61, the input end of which is connected with the second output end of the desorption box; the output end of the tube nest condenser is communicated with the input end of the gas-liquid separator;

a gas-liquid separator 69, the input end of which is communicated with the output end of the tube still condenser; the bottom output end of the gas-liquid separator is communicated with the spiral plate condenser, and the top output end of the gas-liquid separator is communicated with the input end of the main fan;

a first input end of the main fan is communicated with the top output end of the gas-liquid separator, and a second output end of the main fan is respectively communicated with the top output end of the layering tank, the top output end of the water layer tank and the top output end of the solvent tank; the output end of the main fan is communicated with the first input end of the filtering system;

the first input end of the filtering system is connected with the output end of the main fan, and the output end of the filtering system is communicated with the first input end of the surface air cooler; preferably, the filtration system is a filter.

A surface cooler 60, a first input end of which is communicated with the output end of the filtering system; the surface cooler is connected with a condensed water circulating system; the first output end of the surface cooler is communicated with the input end of the spiral plate condenser; the second output end of the surface cooler is communicated with the first input end of the adsorption carbon tank;

the first input end of each carbon tank adsorption carbon tank 70 is communicated with the second output end of the surface cooler through an air inlet valve 701, and the second input end of the carbon tank adsorption carbon tank is communicated with the output end of the high-temperature nitrogen supply device through an analysis inlet valve 53; the first output end of the carbon tank adsorption carbon tank is communicated with the chimney through an air outlet valve 702, and the second output end of the carbon tank adsorption carbon tank is communicated with the input end of the tube still condenser through a resolving valve 703; a first output end of the carbon tank adsorption carbon tank forms a branch and is connected with a circulating fan 43 through a carbon tank adsorption carbon tank bypass valve 601, and the circulating fan is communicated with a second input end of the desorption box through a drying valve 415; two carbon tanks adsorb carbon tank alternate use, when one of them carbon tank adsorbs carbon tank saturation when adsorbing, just adopt high temperature nitrogen gas feeding mechanism to resolve this carbon tank adsorption carbon tank, during the resolution, use another carbon tank adsorption carbon tank to handle waste gas.

A spiral plate condenser 62, the bottom input end of which is communicated with a gas-liquid separator, and the output end of which is communicated with a liquid phase separation system; the spiral plate condenser is connected with a condensed water circulating system;

a liquid phase separation system 80 having a first input in communication with the output of the spiral plate condenser; the first output end of the liquid phase separation system is communicated with the solvent recovery device 82 through a solvent pump 804 and is used for recovering the organic solvent; a second output end of the liquid phase separation system is communicated with a wastewater recovery device 81 through a wastewater pump 805, and the wastewater recovery device is used for recovering wastewater; and a third output end positioned at the top of the liquid phase separation system is communicated with the input end of the main fan. More preferably, the liquid phase separation system includes a layering tank 801, an aqueous layer tank 802, and a solvent tank 803; the layering tank is communicated with the output end of the spiral plate condenser, the layering tank is respectively communicated with the water layer tank and the solvent tank, the water layer tank is communicated with the wastewater recovery device, and the solvent tank is communicated with the solvent recovery device; the output ends of the layering tank, the water layer tank and the solvent tank are also respectively communicated with the input end of the main fan. The water layer tank is communicated with a wastewater recovery device through a wastewater pump 804. The solvent tank is communicated with the solvent recovery device through a solvent pump 805.

A condensate circulating system 90 which is respectively connected with the spiral plate condenser, the tube nest condenser and the surface cooler to provide circulating cooling water; the condensed water circulating system comprises a refrigeration source, a condensed water upper water pipeline and a condensed water return pipeline, and provides cold sources for the heat exchangers. It should also be noted that the condensed water circulation system 90 uses water as the refrigerant, but replaces water with other types of refrigerants, such as: cooling oil was used instead of water.

And the high-temperature nitrogen supply device 50 is respectively communicated with the desorption box A, the desorption box B and the two adsorption carbon tanks through pressure reducing valves (not shown). The high-temperature nitrogen gas supply device 50 is used for supplying high-temperature nitrogen gas, and is not limited to what form the high-temperature nitrogen gas is obtained, for example, a nitrogen gas storage tank may be used for supplying gas, the nitrogen gas is electrically heated and then supplied to the outside, or the nitrogen gas is prepared by a nitrogen gas preparation device and then heated and then supplied to the outside. High-temperature nitrogen is used as a heat supply mode for heating the activated carbon to promote the activated carbon to be resolved. Desorption means desorption of the adsorbed VOCs by activated carbon.

The above-mentioned communication means communication through a pipe, and a valve device for opening and closing the pipe may be provided in the pipe. That is, the two components exchange substances through the pipeline, and one or more valves can be arranged on the pipeline according to requirements for controlling the opening and closing of the pipeline. In order to provide power for the material flow of the pipeline, when the material mainly taking gas is conveyed, a fan can be used for providing conveying power, and when the liquid material is conveyed, a corresponding pump can be used for providing power so as to increase the speed and the efficiency of the treatment. The desorption box is internally provided with an accommodating space for accommodating the activated carbon. The desorption box is provided with a door which can be opened, and activated carbon can be placed into the desorption box when the door is opened.

In addition, the above discussion has discussed the case that desorption case sets up two and attaches the carbon jar and set up two, but the time of implementing this application is not restricted to two desorption cases and two absorption carbon jars, increases the quantity that desorption case, absorption carbon jar were according to the processing demand. Namely: the desorption box group comprises N (N is more than or equal to 2, and N is a natural number) desorption boxes, wherein N is N0 +/-N1, N0 represents the basic number of the desorption boxes (N0 is more than or equal to 2, and N0 is a natural number), N1 represents the change amount of the desorption boxes (N1 is more than or equal to 0, and N1 is a positive integer), and the change amount varies according to the treatment capacity: one or more desorption boxes are added on the basis of the number of the basic desorption boxes, or one or more desorption boxes are reduced on the basis of the number of the basic desorption boxes, but the number of the desorption boxes after adjustment needs to be more than or equal to 2. A plurality of desorption case have constituteed desorption case group. Increasing the number of desorption tanks can increase throughput, and decreasing the number of desorption tanks can decrease throughput. In the working state, X desorption boxes (X is more than or equal to 1, X is less than or equal to (N-1), X is a natural number) are used for desorption operation, and N-X-Y desorption boxes (Y is more than or equal to 0, and Y is a positive integer) are used for cooling operation (the desorption operation is completed).

The carbon adsorption tank group comprises M (M is more than or equal to 2, and M is a natural number) carbon adsorption tanks, and when the desorption tank group is in a working state: at least one adsorption carbon tank is communicated with the desorption box group, and at least one adsorption carbon tank is in an idle state. When the adsorption carbon tanks adsorb VOCs in a saturated mode, nitrogen can be introduced into one or more adsorption carbon tanks at the same time. For example, when M is 3, the number of adsorption canisters in an operating state (adsorbing off-gas) is 1 or 2, and at the same time, the number of adsorption canisters in a desorption operation is 0 or 1 or 2.

It should be noted that, as the processing capacity increases, the size of the adsorption tank set also increases, the number of sets of spiral plate condensers, the number of sets of tube condensers, the number of sets of surface coolers and the like can be increased according to actual situations, and the increase of the number of the sets of the components is to meet the requirement of increasing the processing amount of the VOCs. When the single components are arranged in a group, the parallel connection or the series connection can be adopted. Of course, it is also possible to replace a single module with a more processing-intensive single module. Some examples may also be provided: when the circulating fans are needed to cool the adsorption tanks, the adsorption tanks can be cooled respectively in a mode of connecting the circulating fans in parallel. When will the utility model discloses a when the scheme was changeed, corresponding pipeline, subassembly such as valve set up quantity, relation of connection etc. and will change thereupon too.

The working process is as follows:

1. the desorption boxes A and B can be used for desorption at the same time, and also can be used for back flushing and cooling the desorption boxes to be cooled after desorption by alternately using desorption and dry clean gas treated by the adsorption carbon tank; can be flexibly set according to the processing capacity or the requirement.

2. The desorption box A is taken as an example to explain the step of desorbing the waste activated carbon provided by the user. First, waste activated carbon (with adsorbed VOCs) obtained from a user is put into the desorption tank a. Then introducing high-temperature nitrogen into the desorption box, wherein the high-temperature nitrogen plays a role in providing a heat source, the introduced high-temperature nitrogen is contacted with the waste activated carbon in the desorption box, the waste activated carbon is resolved under the heating action, a part of VOCs directly flows to the spiral plate condenser in a liquid form, and then enters a liquid phase separation system to separate the liquid into water and an organic solvent, and the water and the organic solvent are respectively treated; the other part of VOCs still exists in a gaseous state at high temperature, the gas enters a shell and tube condenser from a desorption box, then enters a gas-liquid separator from the tube nest condenser, the gas-liquid separator respectively outputs gas and liquid, wherein the liquid from the gas-liquid separator enters the spiral plate condenser and then enters the liquid phase separation system, the gas from the gas-liquid separator enters the main fan, the main fan plays a role of sucking the gas, then enters a filter from a main fan, then enters a surface cooler, the surface cooler outputs gas and liquid respectively, the liquid output from the surface cooler enters a spiral plate condenser and a liquid phase separation system, the gas output from the surface cooler enters an adsorption carbon tank, activated carbon, such as granular activated carbon and honeycomb activated carbon, is placed in the adsorption carbon tank, and the adsorption treatment is carried out on the part of gas; the gas output from the adsorption carbon tank is the purified gas, and the emission treatment can be performed. Adsorb carbon tank two stations (two desorption casees) have been designed to creativity this application, and the produced gas of desorption case of current work is treated another desorption case of treating cooling down, has reached waste gas utilization. When the desorption box A is used for treating the waste activated carbon, the valves between the high-temperature nitrogen supply device and the desorption box B as well as the adsorption carbon tank are closed.

3.3.1 when the desorption box A and the desorption box B are used in a crossed manner, after the waste activated carbon of the desorption box A completes a desorption cycle, cooling the desorption box A which completes desorption to a safe temperature by guiding part of clean gas discharged from the adsorption carbon tank through the circulating fan after the final desorption is completed, and then taking out; then putting the waste activated carbon to be treated in the next batch into a desorption box A; simultaneously, the waste activated carbon in the desorption box B is being desorbed, and when the desorption box B finishes desorption, part of the gas finally discharged from the adsorption carbon tank is introduced into the circulating fan, so that the desorption box B is cooled. 3.2 when desorption case A and desorption case B used simultaneously, high temperature nitrogen gas gets into desorption case A and desorption case B simultaneously, carries out a complete desorption flow to desorption case A and desorption case B. And after the final desorption is finished, a part of clean gas discharged by the adsorption carbon tank is introduced by the circulating fan to cool the desorption box A and the desorption box B which finish the desorption. 3.3 the number of desorption tanks can be designed according to the treatment capacity, and the number of desorption and cooling can be changed.

4. And carrying out desorption treatment on the activated carbon in the adsorption carbon tank. The activated carbon in the adsorption carbon tank slowly tends to be in a saturated adsorption state in the gradual use process. The utility model discloses can use high temperature nitrogen gas to carry out the desorption processing to the active carbon that adsorbs in the carbon tank. The utility model provides an adsorb the carbon tank and set two, handle the gas that comes from the surface cooler transmission and only use one of them to adsorb the carbon tank can. When one of the adsorption carbon tanks is saturated and adsorbed or is close to saturation, high-temperature nitrogen is introduced into the adsorption carbon tank, the waste activated carbon in the adsorption carbon tank is analyzed, wherein liquid flows into the spiral condenser, gas directly enters the tubular condenser and then enters the gas-liquid separator, gas output from the gas-liquid separator enters the circulating fan, and liquid output from the gas-liquid separator enters the liquid phase separation system. The two adsorption carbon tanks are alternately used, and when one of the two adsorption carbon tanks is subjected to desorption, the other adsorption carbon tank adsorbs gas transmitted from the surface cooler.

For further explanation:

adsorbing the material. The traditional adsorbing materials capable of purifying waste gas comprise activated carbon, silica gel, molecular sieves and the like, wherein the activated carbon is widely applied and has the best effect. The reason is that other adsorbents (such as silica gel, metal oxide and the like) have polarity, under the coexistence of high-temperature nitrogen, water molecules are combined with adsorbent material molecules, so that the adsorption performance of the adsorption material is reduced, and activated carbon molecules are not easily combined with polar molecules, so that the capacity of adsorbing organic waste gas is improved. Adsorption is mainly carried out by the microporous part of the granular activated carbon. The unique pore structure and surface characteristics of granular activated carbon allow it to exhibit unique properties with respect to the removal of multi-component materials. Has the characteristics of high adsorption capacity, wide applicability, strong buffering capacity and the like. The tank area waste gas belongs to multi-component, small-gas-amount, high-concentration and fluctuating organic waste gas, so that the coal-based activated carbon is adopted for the best adsorption effect. Therefore, a coal-based activated carbon, a granular activated carbon, or a honeycomb activated carbon is provided as an adsorbent (adsorbing material) in the desorption tank or the adsorption carbon tank.

Adsorption principle and process. Because of the presence of unbalanced and unsaturated molecular or chemical bonds on the solid surface, when the solid surface is in contact with a gas, the gas molecules are attracted, concentrated and held on the solid surface, a phenomenon known as adsorption. The adsorption method is to make the waste gas contact with the porous solid matter on the large surface by utilizing the adsorption capacity of the solid surface, and the pollutant in the waste gas is adsorbed on the solid surface to separate from the gas mixture, thereby achieving the purpose of purification. The active carbon adsorption is physical adsorption, and organic substances in the air are separated and enriched to the surface of active carbon micropores, so that the gas is purified. When industrial waste gas containing organic substances passes through the activated carbon bed layer, the organic substances in the industrial waste gas can be adsorbed and intercepted by the activated carbon, so that the waste gas is purified. The active carbon for adsorbing organic matters heats the active carbon bed layer by utilizing high-temperature nitrogen or hot air, provides heat for the organic matters adsorbed by the active carbon, improves the kinetic energy of the organic matters, gets rid of the constraint of an adsorbent, is released by blowing, and is discharged out of a desorption box. And after the desorption materials are subjected to heat exchange treatment by a condenser, condensing organic matters into liquid, and realizing organic solvent recovery.

Description of the treatment process: after the gas transmitted from the surface cooler is adsorbed and purified by the high-efficiency activated carbon bed layer on the adsorption carbon tank, the organic solvent in the waste gas is adsorbed and intercepted by the activated carbon, and the gas can reach the design requirement and is discharged to the atmosphere through a chimney. The adsorption carbon tank discharge port department sets up on-the-spot emission concentration monitoring instrument, and whether control emission concentration is up to standard, and the adsorption carbon tank that reaches adsorption saturation stops adsorbing, adopts high temperature nitrogen desorption regeneration. Through setting up two sets of absorption carbon tanks, when an absorption carbon tank adsorbs, another absorption carbon tank can carry out high temperature nitrogen gas analytic, can promote treatment effeciency like this.

The desorption box is sealed after being filled with the granular carbon, and the desorption system is started to automatically operate by one key. And blowing the granular carbon bed layer in the desorption box by using high-temperature nitrogen, feeding the desorbed mixture of the organic solvent and water vapor into a tubular condenser, feeding the condensed gas-liquid mixture into a gas-liquid separator and a spiral plate condenser, and feeding the mixed liquid phase of the organic solvent and water into a layering tank. After gravity layering, the light layer and the heavy layer are respectively recovered and stored through different pipeline routes. The self-condensed water solution in the tank body is discharged into the spiral plate condenser through a self-flowing port at the bottom of the tank body, and then enters the layering tank. Namely, the bottom parts of the desorption box A, the desorption box B and the adsorption carbon tank are respectively provided with a self-flowing port. The desorption box after desorption is not directly subjected to adsorption operation due to the fact that a large amount of high-temperature nitrogen is remained and the temperature of the bed layer is high, and the desorption box needs to be cooled and dried.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims

1. A nitrogen centralized desorption system for treating waste activated carbon containing VOCs is characterized by comprising a filtering system, a main fan, a circulating fan, at least two groups of desorption boxes, at least two groups of adsorption carbon tanks, a chimney, a high-temperature nitrogen supply device, a condensed water circulating system, a tubular condenser, a gas-liquid separator, a surface cooler, a liquid phase separation system, a solvent recovery device and a wastewater recovery device; wherein, desorption incasement portion is equipped with and is used for placing useless active carbon accommodation space, high temperature nitrogen gas supply device respectively with desorption case, adsorb the carbon tank and communicate, desorption case respectively with the tubulation condenser, the spiral plate condenser communicates, the spiral plate condenser respectively with the vapour and liquid separator, desorption case, the surface cooler, the carbon tank communicates, the vapour and liquid separator respectively with main fan, the spiral plate condenser communicates, main fan and filtration system communicate, filtration system and surface cooler communicate, the surface cooler respectively with the spiral plate condenser, adsorb the carbon tank and communicate with tubulation condenser, the spiral plate condenser, the chimney respectively; the chimney is respectively communicated with the circulating fan and the desorption box which finishes desorption, and the desorption box which finishes desorption is communicated with the tube nest condenser; the spiral plate condenser is communicated with the liquid phase separator, and the liquid phase separation system is respectively communicated with the main fan, the solvent recovery device and the wastewater recovery device; the condensed water circulating system is respectively connected with the spiral plate condenser, the tube array condenser and the surface cooler to provide circulating cooling water; the number of desorption tanks may be increased or decreased according to the throughput.

2. A concentrated nitrogen desorption system for processing waste activated carbon containing VOCs as claimed in claim 1 wherein said desorption tank is provided with two sets of desorption tank a and desorption tank B, respectively, and said adsorption canister is provided with two sets of adsorption canister a and adsorption canister B, respectively; the output end of the high-temperature nitrogen supply device is provided with a pressure reducing valve, the pressure reducing valve is communicated with four analytic inlet valves respectively, and each analytic inlet valve is communicated with a desorption box A, a desorption box B, an adsorption carbon tank A and an adsorption carbon tank B respectively.

3. A concentrated nitrogen desorption system for spent activated carbon containing VOCs as claimed in claim 2 wherein said liquid phase separation system comprises a stratification tank, a water layer tank and a solvent tank; the layering tank is communicated with the output end of the spiral plate condenser, the layering tank is respectively communicated with the water layer tank and the solvent tank, the water layer tank is communicated with the wastewater recovery device, and the solvent tank is communicated with the solvent recovery device; the output ends of the layering tank, the water layer tank and the solvent tank are also respectively communicated with the input end of the main fan.

4. A concentrated nitrogen desorption system for activated carbon containing VOCs according to claim 3 wherein said water layer tank is in communication with a waste water recovery unit via a waste water pump.

5. A concentrated nitrogen desorption system for activated carbon containing VOCs according to claim 4 wherein the solvent tank is in communication with the solvent recovery means via a solvent pump.

6. A concentrated nitrogen desorption system for processing waste activated carbon containing VOCs according to claim 5 wherein the condensed water circulation system comprises a condensed water upper portion, a circulation pipeline and a condensed water return portion.

7. A concentrated nitrogen desorption system for spent activated carbon containing VOCs according to claim 6 wherein an output of the desorption tank is in communication with the spiral plate condenser through a desorption valve.

8. A concentrated nitrogen desorption system for spent activated carbon containing VOCs according to claim 7,

the first input end of the surface cooler is communicated with the output end of the filtering system; the surface cooler is connected with a condensed water circulating system; the first output end of the surface cooler is communicated with the input end of the spiral plate condenser; the second output end of the surface cooler is communicated with the first input end of the adsorption carbon tank;

9. A concentrated nitrogen desorption system for activated carbon containing VOCs as claimed in claim 8 wherein the top output of said stratification tank, the top output of the water layer tank and the top output of the solvent tank are connected to the second input of the main blower, respectively.