Tail gas ultralow emission system for saturated activated carbon regeneration

Abstract

The invention provides a tail gas ultra-low emission system for saturated activated carbon regeneration, which comprises a pretreatment module, a deep purification module and an intelligent control system, the pretreatment module comprises a cyclone separator and a condensing device, the cyclone separator and the condensing device are mounted at the starting end of a tail gas emission pipeline, and the deep purification module is mounted at the starting end of the tail gas emission pipeline. The cyclone separator is used for separating large-particle dust and impurities in tail gas, the condensing device is used for cooling the tail gas, the deep purification module comprises a composite adsorption tower and a low-temperature plasma reactor, the composite adsorption tower is used for adsorbing organic matters and heavy metal ions in the tail gas, and the low-temperature plasma reactor is used for carrying out low-temperature plasma treatment on the tail gas. Through the synergistic effect of pretreatment, composite adsorption and low-temperature plasma treatment, the concentration of pollutants in the saturated activated carbon regeneration tail gas can be reduced to be lower than the ultra-low emission standard, pollution to the environment is effectively reduced, and compared with a traditional technology, the method is low in energy consumption, long in service life of an adsorbent and suitable for industrial production. And the cost of frequently replacing the adsorbent and the catalyst is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of activated carbon regeneration, in particular to a tail gas ultra-low emission system for saturated activated carbon regeneration. BACKGROUND

[0002] In the process of saturated activated carbon regeneration, tail gas emission has always been a concern. The mainstream tail gas treatment technologies on the market mainly include combustion method, adsorption method and catalytic purification method. The combustion method can effectively reduce the concentration of pollutants by oxidizing and decomposing organic pollutants in the tail gas into carbon dioxide and water at high temperature, but the energy consumption is high, and nitrogen oxides and other secondary pollutants may be produced. The adsorption method uses adsorbents (such as activated carbon, molecular sieve, etc.) to adsorb pollutants in the tail gas, but the adsorbents are easy to saturate and need to be replaced frequently, which increases the operating cost, and the adsorption effect on low-concentration pollutants is limited. The catalytic purification method uses catalysts to promote the chemical reaction of pollutants in the tail gas at a lower temperature to convert them into harmless substances, but the catalysts are expensive and require harsh reaction conditions, and are easy to be poisoned and deactivated. Although there are some improvement measures in the field of tail gas ultra-low emission, it is still difficult to meet the requirements of high efficiency, low cost and stable operation at the same time. At present, the existing tail gas ultra-low emission technology for saturated activated carbon regeneration has the following defects: 1. It is difficult to meet the emission standard: with the increasing strictness of environmental protection standards, it is difficult for the existing tail gas treatment technology to reduce the concentration of pollutants to below the ultra-low emission standard when treating the tail gas of saturated activated carbon regeneration, especially for some complex organic pollutants and trace heavy metal pollutants, the treatment effect is not good; 2. High operating cost: whether it is the high energy consumption of the combustion method, or the frequent replacement of adsorbents in the adsorption method, and the expensive catalysts in the catalytic purification method, all lead to high operating cost of tail gas treatment, which increases the economic burden of enterprises and limits the wide application of the technology.

[0003] Therefore, it is necessary to design a tail gas ultra-low emission system for saturated activated carbon regeneration to improve the above problems. SUMMARY

[0004] In view of the defects of the prior art, the purpose of the present application is to provide a tail gas ultra-low emission system for saturated activated carbon regeneration, which aims to solve the problems of difficult to meet the emission standard and high operating cost of the existing saturated activated carbon regeneration.

[0005] To solve the above technical problems, the present application provides the following technical scheme: A tail gas ultra-low emission system for saturated activated carbon regeneration, comprising: The pre-treatment module comprises a cyclone separator and a condensing device, the cyclone separator and the condensing device are installed at the starting end of the tail gas discharge pipeline, the cyclone separator is used for separating large particle dust and impurities in the tail gas, and the condensing device is used for cooling treatment of the tail gas. The deep purification module comprises a composite adsorption tower and a low-temperature plasma reactor, the composite adsorption tower is used for adsorbing organic matters and heavy metal ions in the tail gas, and the low-temperature plasma reactor is used for deep removal of the organic matters in the tail gas.

[0006] As a preferred aspect of the present application, the composite adsorption tower is filled with a composite adsorbent.

[0007] As a preferred aspect of the present application, the composite adsorbent is composed of activated carbon fibers and nanoscale molecular sieves.

[0008] As a preferred aspect of the present application, the intelligent control system further comprises a sensor assembly and a controller, and the sensor assembly is arranged inside the tail gas discharge pipeline.

[0009] Compared with the prior art, the present application has at least the following beneficial effects: The present application can reduce the pollutant concentration in the saturated activated carbon regeneration tail gas to below the ultra-low emission standard through the synergistic effect of pre-treatment, composite adsorption and low-temperature plasma treatment, effectively reducing the pollution to the environment, compared with the traditional technology, the present application has low energy consumption, long service life of adsorbent, reduces the cost of frequent replacement of adsorbent and catalyst, at the same time, the intelligent control system realizes energy-saving operation, greatly reduces the operation cost, the intelligent control system can adjust the equipment operation state in real time according to the change of tail gas parameters, ensures the stability of the tail gas treatment effect, reduces the risk of emission exceeding the standard caused by equipment failure or working condition change, the present application has the advantages of ultra-low emission, low operation cost and high stability. BRIEF DESCRIPTION OF DRAWINGS

[0010] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments of the present application and, together with the specification, further serve to explain the principles of the present application and to enable a person skilled in the relevant art to implement and use the present application.

[0011] Figure 1 It is a working process schematic diagram of the tail gas ultra-low emission system for saturated activated carbon regeneration. DETAILED DESCRIPTION

[0012] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0013] Embodiment: As shown in the figure, the embodiment of the present application provides a tail gas ultra-low emission system for saturated activated carbon regeneration, which comprises a pretreatment module, a deep purification module and an intelligent control system. Figure 1

[0014] In the present embodiment, the pretreatment module comprises a cyclone separator and a condensing device, which are installed at the starting end of the tail gas emission pipeline. The tail gas emission pipeline is a device in the saturated activated carbon regeneration equipment, which is prior art and will not be described in detail here. The cyclone separator is used to separate large particle dust and impurities in the tail gas. The cyclone separator separates large particle dust and impurities in the tail gas by using the principle of centrifugal force. Special spiral blade design is adopted inside the cyclone separator to improve the separation efficiency and reduce the wear of the subsequent treatment equipment.

[0015] The condensing device is used for cooling treatment of the tail gas. The cooling medium (such as circulating water) is used to cool the tail gas, so that part of the water vapor and easily condensed organic pollutants in the tail gas are condensed into liquid, which is discharged through the drainage structure. The condensing device adopts high-efficiency heat exchange structure to ensure that the tail gas can be quickly cooled, while reducing energy consumption.

[0016] In the present embodiment, the deep purification module comprises a composite adsorption tower and a low-temperature plasma reactor. The composite adsorption tower is used to adsorb organic matter and heavy metal ions in the tail gas. The composite adsorption tower is filled with special composite adsorbent composed of activated carbon fiber and nanoscale molecular sieve. The activated carbon fiber has a large specific surface area and a rich microporous structure, which can quickly adsorb organic pollutants in the tail gas. The nanoscale molecular sieve has a high selective adsorption effect on small molecule pollutants and heavy metal ions. The composite adsorbent is loaded in a layered manner to improve the adsorption efficiency and uniformity.

[0017] The low-temperature plasma reactor is used for deep removal of organic matter in the tail gas. After the composite adsorption tower, the low-temperature plasma generated by high-voltage discharge is used to further purify the tail gas after adsorption treatment. The high-energy electrons, free radicals and other active particles in the low-temperature plasma can chemically react with the residual organic pollutants to decompose them into harmless substances such as carbon dioxide and water. The electrode inside the low-temperature plasma reactor adopts special insulation material and structure design to improve the plasma generation efficiency and stability. ​

[0018] In the present embodiment, the intelligent control system comprises a sensor assembly and a controller. The sensor assembly is arranged inside the tail gas discharge pipeline. Various sensors, such as gas concentration sensors, temperature sensors, pressure sensors, etc., are installed at different positions of the tail gas discharge pipeline to monitor the composition, temperature, pressure and other parameters of the tail gas in real time. The controller receives the data transmitted by the sensors and automatically adjusts the operating parameters of the devices in the pretreatment module and the deep purification module, such as the cooling temperature of the condensing device, the adsorption time and regeneration period of the composite adsorption tower, and the discharge voltage of the low-temperature plasma reactor, according to the preset program and algorithm, to ensure that the tail gas treatment effect is always in the best state and energy-saving operation is realized.

[0019] The operation steps of the regeneration system for saturated powdered activated carbon include the following three stages: Pretreatment stage: After the saturated activated carbon regeneration tail gas enters the cyclone separator, large particles of dust and impurities are thrown to the inner wall of the separator due to the centrifugal force during high-speed rotation, slide along the wall to the bottom collection device, and achieve preliminary separation. The tail gas after cyclone separation enters the condensing device, and the cooling medium exchanges heat with the tail gas, reducing the temperature of the tail gas. The water vapor and easily condensable organic pollutants in the tail gas condense into liquid and are discharged through the drainage pipeline, reducing the load of the subsequent treatment equipment. Deep purification stage: The pretreated tail gas enters the composite adsorption tower, and organic pollutants, small molecule pollutants and heavy metal ions are adsorbed by the composite adsorbent. The activated carbon fiber first adsorbs large molecule organic pollutants, and the nanoscale molecular sieve further adsorbs small molecule pollutants and heavy metal ions, so that the tail gas is deeply purified. A small amount of pollutants remaining after adsorption treatment enter the low-temperature plasma reactor, where active particles collide with pollutant molecules in the low-temperature plasma environment generated by high-voltage discharge, causing oxidation and other reactions to decompose the pollutants into harmless substances, achieving ultra-low emission of the tail gas. Intelligent control stage: The sensors collect various parameters of the tail gas in real time and transmit the data to the controller. The controller automatically adjusts the operating parameters of the devices in the pretreatment module and the deep purification module according to the preset emission standards and operation optimization strategies. For example, when the gas concentration sensor detects an increase in the concentration of pollutants in the tail gas, the controller automatically extends the adsorption time of the composite adsorption tower or increases the discharge voltage of the low-temperature plasma reactor to ensure the tail gas treatment effect.

[0020] The application can reduce the pollutant concentration in the saturated activated carbon regeneration tail gas to below the ultra-low emission standard through the synergistic effect of pretreatment, composite adsorption and low-temperature plasma treatment, effectively reducing pollution to the environment, compared with traditional technologies, the application has low energy consumption, long service life of adsorbent, reduces the cost of frequent replacement of adsorbent and catalyst, at the same time, the intelligent control system realizes energy-saving operation, greatly reduces the operation cost, the intelligent control system can adjust the equipment operation state in real time according to the change of tail gas parameters, ensures the stability of the tail gas treatment effect, reduces the risk of emission exceeding the standard caused by equipment failure or working condition change, the application has the advantages of ultra-low emission, low operation cost and high stability.

[0021] The application scenarios of the application for the saturated activated carbon regeneration tail gas ultra-low emission system include but are not limited to the following fields: Industrial waste gas treatment industry: for the treatment of waste gas containing organic pollutants and heavy metal pollutants generated in other industrial production processes, the technology is also applicable, and the ultra-low emission of industrial waste gas can be realized.

[0022] Garbage incineration tail gas treatment: the tail gas generated in the garbage incineration process is complex and contains a large amount of pollutants, the technology can effectively purify the garbage incineration tail gas and reduce the harm to the surrounding environment and residents.

[0023] The above is only the preferred embodiment of the application, it should be pointed out that for ordinary skilled in the art, without departing from the principles of the application, a number of improvements and refinements can be made, these improvements and refinements should also be considered as the protection scope of the application.

Claims

1. An ultra-low exhaust emission system for regeneration of saturated activated carbon, characterized in that: include: A pre-treatment module, comprising a cyclone separator and a condensing device, which are installed at the starting end of the exhaust gas discharge pipeline. The cyclone separator is used to separate large particles of dust and impurities in the exhaust gas, and the condensing device is used to cool the exhaust gas; A deep purification module includes a composite adsorption tower and a low-temperature plasma reactor. The composite adsorption tower is used to adsorb organic matter and heavy metal ions in the tail gas, and the low-temperature plasma reactor is used to deeply remove organic matter in the tail gas.

2. The ultra-low exhaust emission system for saturated activated carbon regeneration according to claim 1, characterized in that: The composite adsorption tower is filled with a composite adsorbent.

3. The ultra-low exhaust emission system for saturated activated carbon regeneration according to claim 2, characterized in that: The composite adsorbent is composed of activated carbon fibers and nano-scale molecular sieves.

4. The ultra-low exhaust emission system for regeneration of saturated activated carbon according to claim 1, characterized in that: It also includes an intelligent control system, which includes a sensor component and a controller. The sensor component is arranged inside the exhaust gas exhaust pipe.

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