CN205903778U - Flue gas purification system - Google Patents

Abstract

The utility model provides a flue gas purification system. The flue gas purification system includes an incinerator, an SNCR denitrification device, a lime water unit, a power unit, and a granular bed moving bed reactor; There is a flue gas outlet at the end; the SNCR denitrification device is connected to the incinerator; the incinerator is connected to the flue gas inlet; the power unit is connected to the flue gas outlet; the lime water unit is set on the pipeline connecting the incinerator to the flue gas inlet , or, the lime water unit communicates with the flue gas inlet; at least one granular layer and at least one activated carbon layer are arranged in the cavity of the granular bed moving bed reactor, and at least one The ammonia water inlet, the granular layer is filled with active particles, the activated carbon layer is filled with activated carbon, and the ammonia water inlet is arranged between the granular layer and the activated carbon layer.

Description

A flue gas purification system

technical field

The utility model belongs to the technical field of flue gas treatment, and relates to a flue gas purification system, in particular to a waste incineration flue gas purification system.

Background technique

With the acceleration of my country's urbanization process, the output of municipal solid waste is increasing year by year. At present, the annual production of domestic waste in the country exceeds 360 million tons, of which urban domestic waste accounts for 150-160 million tons, and is growing at an average annual rate of 8%. Therefore, the problem of urban garbage has become one of the most serious public hazards in the world today. Cleaning up and disposing of garbage in time is an indispensable condition for building a beautiful China and a beautiful, clean and civilized modern city. As a treatment technology with the most complete harmlessness, the most significant volume reduction, and the highest degree of resource utilization, waste incineration has become an important technology for domestic waste treatment in today's international society. However, there are many kinds of harmful substances contained in waste incineration flue gas, including ash, hydrogen chloride (HCl), hydrogen fluoride (HF), sulfur oxides (SO _x ), nitrogen oxides (NO _x ), heavy metals such as lead, mercury, and cadmium. elements and substances such as dioxins. If the harmful substances in the flue gas of waste incineration are not purified up to the standard, it will cause great pollution to the atmosphere. Therefore, the treatment of flue gas from domestic waste incineration has become a key issue of public concern. On July 1, 2014, with the implementation of the new national standard "Pollution Control Standards for Domestic Waste Incineration" (GB18485-2014), China's requirements for waste incineration flue gas emissions have been greatly improved, especially for dioxin emissions. Consistent with the EU2000/76 standard of the European Union, it is 0.1TEQng/m ³ .

Waste incineration flue gas treatment mainly deals with the smoke, toxic and harmful gases, nitrogen oxides, etc. generated by incineration, focusing on reducing dioxin and heavy metal pollution and PM2.5 fine dust. The existing technology usually adopts semi-dry method and dry method to treat the flue gas of domestic waste incineration to eliminate acid smoke and nitrogen oxides _NOx produced by incineration, and reduce dioxin and heavy metal pollution and PM2.5 fine dust. The patent application with application number 201510057152.X discloses a combined deacidification and dust removal method and system for domestic waste incineration flue gas. The primary, secondary and tertiary deacidification reactions, especially the secondary and tertiary deacidification reactions of adding slaked lime powder in the primary and secondary bag reactors, can fully remove the acid gas; The activated carbon powder adsorption of the grade cloth bag reactor effectively removes the pollution of heavy metals and dioxins. However, this technology has three main systems of spray reaction tower, primary and secondary bag reactors, the process flow is complicated, and the project investment is relatively large, and the technology itself does not have an effective denitrification system, which cannot remove the pollutants in the flue gas of domestic waste incineration. Nitrogen oxides. The patent application with the application number _{201210428844.7} discloses a comprehensive purification system and purification method for waste incineration flue gas. Process preparation, the preheated flue gas is heated to >85°C through a heat exchanger, and then sent to a carbon-based adsorption reactor (at least one layer of a carbon-based adsorption reactor) to react with injected NH ₃ , etc., to remove The _NOx in the flue gas is incinerated, and the purified flue gas is discharged into the atmosphere through the chimney through the induced draft fan. However, this technology is composed of semi-dry deacidification reactor, dust collector and carbon-based adsorption reactor and other systems, and the process is complicated and the investment is high. There is no dust removal facility after passing through the carbon-based adsorption reactor, and the flue gas at the outlet has a large dust content; the flue gas needs to be heated before entering the carbon-based reactor, which consumes a lot of energy. In addition, due to the limitations of the process methods, the existing or proposed processes of domestic enterprises generally have the following problems: first, the denitrification efficiency is low, and it is difficult to meet the EU standard; second, the process is complicated and requires a deacidification reactor There are two major systems with the dust collector; the third is that the filter bag of the dust collector is difficult to handle, and there is secondary pollution; the fourth is that the core equipment needs to be imported and cannot be localized.

Therefore, finding a more effective way to purify waste incineration flue gas is a necessary way to meet the requirements of the new national standard.

Utility model content

In view of the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a flue gas purification system. The flue gas purification system can be used to treat waste incineration flue gas, so that ash, hydrogen chloride (HCl), hydrogen fluoride (HF), sulfur oxides (SO _x ), nitrogen oxides (NO _x ), Heavy metal elements such as lead, mercury, cadmium, and dioxins are all removed in the same moving bed reactor, and there is no need to use dust collector filter bags.

In order to achieve the aforementioned purpose, the utility model provides a flue gas purification system, which includes an incinerator, an SNCR denitrification device, a lime water unit, a power unit and a particle bed moving bed reactor;

The particle bed moving bed reactor is a cavity-containing structure, the front end is provided with a flue gas inlet, and the rear end is provided with a flue gas outlet;

The SNCR denitration device is communicated with the incinerator;

The incinerator communicates with the flue gas inlet; the power unit communicates with the flue gas outlet;

The lime water unit is arranged on the pipeline that the incinerator communicates with the flue gas inlet, or, the lime water unit communicates with the flue gas inlet;

At least one granular layer and at least one activated carbon layer are arranged in the cavity of the granular bed moving bed reactor, and at least one ammonia water inlet is also arranged on the cavity wall of the granular bed moving bed reactor, and the granular layer is filled with Active particles, the activated carbon layer is filled with activated carbon, and the ammonia water inlet is arranged between the particle layer and the activated carbon layer.

In the above flue gas purification system, the granular bed moving bed reactor can expand the ash, hydrogen chloride (HCl), hydrogen fluoride (HF), sulfur oxides (SO _x ), nitrogen oxidation in the incineration flue gas by moving slowly. It can realize the removal of the above _pollutants in a single reactor.

In the above-mentioned flue gas purification system, the SNCR denitrification device is a conventional system in the art, that is, a system device that uses SelectiveNon-Catalytic Reduction (SNCR) to remove _NOx in flue gas, which can convert the The flue gas produced in the incinerator is initially denitrated; the lime water unit can be used to prepare lime water and inject lime water into the flue gas that has undergone preliminary denitrification for preliminary deacidification, and neutralize the hydrogen chloride (HCl) contained in the flue gas ), hydrogen fluoride (HF) and sulfur oxides (SO _x ) and other acidic substances; treatment, the granular layer in the moving bed reactor contains active particles for filtration, which can further remove acidic acids such as hydrogen chloride (HCl), hydrogen fluoride (HF) and sulfur oxides (SO _x ) in the flue gas substances, while the granular layer can also trap ash, some heavy metals and dioxin-like substances; the ammonia water inlet in the granular bed moving bed reactor can inject ammonia water into the cavity of the granular layer moving bed reactor. While neutralizing a part of the acidic substances, the activated carbon in the activated carbon layer is used as a catalyst and a carrier, thereby completing the secondary removal of nitrogen oxides (NO _x ); the activated carbon layer in the granular bed moving bed reactor contains Catalyzed activated carbon can capture ash, some heavy metals and dioxins while completing the secondary removal of nitrogen oxides (NO _x ), and finally purify the flue gas to meet emission standards; the power device serves as The power source of the entire flue gas purification system, which can guide the direction of movement of the flue gas. The front and rear ends of the particle bed moving bed reactor are determined by the direction of movement of the flue gas. The flue gas first contacts (that is, the flue gas enters) The position of the granular layer moving bed reactor is the front end of the granular layer moving bed reactor, and the position where flue gas exits the granular layer moving bed reactor is the rear end of the granular layer moving bed reactor. Under the guidance of the above-mentioned power device, the flue gas generated in the incinerator is sequentially treated by the lime water unit and the granular bed moving bed reactor, and then discharged after reaching the emission standard.

In the above flue gas purification system, the active particles include one or a combination of quartz sand, expanded perlite, gravel and slag.

In the above-mentioned flue gas purification system, preferably, the power device includes an induced draft fan, and the induced draft fan is arranged at the flue gas outlet of the granular layer moving bed reactor;

The flue gas purification system also includes a chimney, and the chimney communicates with the power device.

In the above-mentioned flue gas purification system, the flue gas generated by the incinerator is treated by the particle bed moving bed reactor, and after reaching the emission standard, it is discharged into the atmosphere through the chimney under the guidance of the induced draft fan.

In the above-mentioned flue gas purification system, preferably, the front part of the chamber of the granular bed moving bed reactor is surrounded by the granular layer or activated carbon layer arranged in the chamber to form a reaction chamber.

In the above flue gas purification system, the front part of the cavity of the granular layer moving bed reactor is the side of the cavity of the granular layer moving bed reactor close to the flue gas inlet, when the lime When the water unit is connected with the flue gas inlet, the reaction chamber formed by the front part of the cavity of the granular bed moving bed reactor and the granular layer or activated carbon layer arranged in the cavity can make the lime water have enough Preliminary deacidification of flue gas after preliminary denitrification is carried out in the appropriate space and time.

In the above flue gas purification system, preferably, a flue gas detection and analysis device is further provided at the flue gas inlet of the particle bed moving bed reactor. A flue gas detection and analysis device is installed at the flue gas inlet of the granular bed moving bed reactor, which can detect the concentration and composition of the flue gas entering the granular bed moving bed reactor, and analyze the flue gas according to the detected data. Adjust the number of granular layer and activated carbon layer in the granular layer moving bed reactor. The specific method is: according to the sulfur content and dust content in the flue gas detected by the flue gas detection and analysis device, the quantity of the granular layer and the activated carbon layer in the granular bed moving bed reactor is adjusted, when the flue gas contains When the amount of dust is large, a widened granular layer or two layers of granular layers can be set; when the sulfur content in the flue gas is large, a widened activated carbon layer or two layers of activated carbon can be set.

In the above-mentioned flue gas purification system, preferably, the flue gas purification system further includes a granular layer fresh material device, and the granular layer fresh material device is in communication with the granular layer in the granular bed moving bed reactor. The active particles in the particle bed moving bed reactor can be continuously replaced and replenished through the particle layer fresh material device, thereby ensuring the activity of the particle layer.

In the above flue gas purification system, preferably, the flue gas purification system further includes a particle layer regeneration device, and the particle layer regeneration device is in communication with the particle layer in the particle bed moving bed reactor. Through the granular layer regeneration device, the deactivated active particles in the granular layer moving bed reactor can be desorbed, regenerated and recycled.

In the above-mentioned flue gas purification system, preferably, the granular layer raw material device is in communication with the granular layer regeneration device.

In the above-mentioned flue gas purification system, the granular layer raw material device, the granular layer on the granular layer moving bed reactor and the granular layer regeneration device form a circulation system, so that the granular layer used for filtering Active particles can be reused through regeneration.

In the above flue gas purification system, preferably, the flue gas purification system further includes an activated carbon fresh material device, and the activated carbon fresh material device is in communication with the activated carbon layer in the granular bed moving bed reactor. Through the activated carbon fresh material device, the activated carbon in the granular bed moving bed reactor can be continuously replaced and replenished, thereby ensuring the activity of the activated carbon layer.

In the above flue gas purification system, preferably, the flue gas purification system further includes an activated carbon regeneration device, and the activated carbon regeneration device is in communication with the activated carbon layer in the granular bed moving bed reactor. Through the activated carbon regeneration device, the deactivated activated carbon in the granular bed moving bed reactor can be desorbed, regenerated and recycled.

In the above flue gas purification system, preferably, the activated carbon raw material device is in communication with the activated carbon regeneration device.

In the above-mentioned flue gas purification system, the activated carbon raw material device, the activated carbon layer on the granular bed moving bed reactor and the activated carbon regeneration device form a circulation system, so that the activated carbon used for filtration and catalysis on the granular layer Activated carbon can be reused through regeneration.

According to specific embodiments, the flue gas purification system provided by the utility model can perform flue gas purification through the following steps:

(1) Put domestic garbage into the incinerator for incineration, and use SNCR denitrification device to spray urea into the incinerator to initially remove nitrogen oxides (NO _x ) in the incineration flue gas to obtain preliminary denitrification flue gas;

(2) Then utilize the induced draft fan to introduce the flue gas of this preliminary denitrification through the pipeline into the granular bed moving bed reactor, and in the pipeline leading into the granular bed moving bed reactor, utilize the lime water unit to spray lime water to neutralize the Acidic substances such as hydrogen chloride (HCl), hydrogen fluoride (HF) and sulfur oxides (SO _x ) in the flue gas of the preliminary denitrification are initially deacidified;

(3) Under the guidance of the induced draft fan, the flue gas that has undergone preliminary denitrification and deacidification enters the granular bed moving bed reactor, and the granular layer in the granular bed moving bed reactor is used as the carrier to remove hydrogen chloride (HCl), hydrogen fluoride (HF ), sulfur oxides (SO _x ) and other acidic substances, and the granular layer also traps some ash, dioxins and heavy metals, such as lead, mercury, cadmium, chromium, copper, etc.;

(4) After the granular layer removes ash, acidic substances, heavy metals and dioxins, the ammonia water inlet sprays ammonia water into the granular layer moving bed reactor to further neutralize the acidic substances, and at the same time make the granular layer moving bed reactor The activated carbon layer is used as a catalyst and carrier to further remove nitrogen oxides (NO _x ) in the flue gas. The activated carbon layer also captures ash, dioxins and heavy metals in the flue gas to further purify the flue gas, achieving Emission Standards;

(5) The flue gas that step (4) reaches the emission standard is discharged into the atmosphere through the chimney by the induced draft fan;

Wherein, the number of the particle layer and the activated carbon layer can be adjusted according to the composition and concentration of the flue gas detected by the flue gas detection and analysis device; when the dust content in the flue gas is large, a widened particle layer or Set up two layers of granular layers; when the sulfur content in the flue gas is large, you can set up a widened activated carbon layer or set up two layers of activated carbon layers;

When the active particles in the granular layer are adsorbed and saturated, the granular layer is sent to the granular layer regeneration device for desorption. At the same time, the granular layer fresh material device inputs new active particles to the granular layer moving bed reactor to form granular layer, continue to step (3), and in the granular layer regeneration device, the ash, acidic substances, heavy metals and dioxins adsorbed in the granular layer are removed, and the active particles recover their adsorption capacity, and then the recovery of the adsorption capacity The active granules are sent to the granular layer fresh material device for standby;

When the activated carbon in the activated carbon layer is adsorbed and saturated, the activated carbon layer is sent to the activated carbon regeneration device for desorption, and at the same time, the activated carbon new material device inputs new activated carbon to the granular bed moving bed reactor to form an activated carbon layer and continue Step (4), in the activated carbon regeneration device, the ash, heavy metals and dioxins adsorbed in the activated carbon layer are removed, the activated carbon restores its adsorption capacity, and then the activated carbon with restored adsorption capacity is sent to the activated carbon fresh material device spare.

Compared with the prior art, the beneficial effects of the utility model are:

(1) The flue gas purification system provided by the utility model can carry out deacidification, denitrification, dust removal, and removal of heavy metals and dioxins by using a granular bed moving bed reactor, which simplifies the technological process of flue gas purification, Reduced project cost;

(2) The flue gas purification system provided by the utility model does not use a bag filter, which avoids the generation of secondary pollutants;

(3) The flue gas purification system provided by the utility model has a complete material regeneration device and a new material replenishment device, so that both active particles and activated carbon for filtration can be recycled and reused through regeneration, ensuring the activity of the particle bed moving bed reactor;

(4) The flue gas purification system provided by the utility model includes two denitrification devices, the SNCR denitrification device and the granular bed moving bed reactor, which can perform secondary removal of nitrogen oxides (NO _x ) in the flue gas and improve the denitrification efficiency , and then reduce the emission of nitrogen oxides to meet the EU emission standards;

(5) The flue gas purification system provided by the utility model includes two deacidification devices of a lime water unit and a granular bed moving bed reactor, which can treat hydrogen chloride (HCl) in the flue gas, hydrogen fluoride (HF), and sulfur oxides ( SO _x ) and other acidic substances for secondary removal.

Description of drawings

FIG. 1 is a schematic structural view of the waste incineration flue gas purification system in Embodiment 1.

Symbol Description:

1 SNCR denitrification device, 2 lime water preparation and injection device, 3 granular layer moving bed reactor,

4 granular layer fresh material device, 5 granular layer regeneration device, 6 ammonia injection device, 7 activated carbon regeneration device,

8 Activated carbon raw material device, 9 induced draft fan, 10 chimney, 11 flue gas detection and analysis device.

detailed description

In order to have a clearer understanding of the technical features, purpose and beneficial effects of the present utility model, the technical solution of the present utility model is described in detail below, but it should not be construed as limiting the practical scope of the utility model.

Example 1

This embodiment provides a waste incineration flue gas purification system, as shown in Figure 1, which includes a waste incinerator, an SNCR denitrification device 1, a lime water preparation and injection device 2, a granular bed moving bed reactor 3, a granular bed new Material device 4, particle layer regeneration device 5, ammonia water injection device 6, activated carbon regeneration device 7, activated carbon new material device 8, induced draft fan 9, chimney 10 and flue gas detection and analysis device 11;

The granular bed moving bed reactor 3 is a cavity-containing structure, the front end is provided with a flue gas inlet, and the rear end is provided with a flue gas outlet. The cavity of the granular bed moving bed reactor 3 is provided with a granular layer and an activated carbon layer. , the granular layer is filled with active particles, the activated carbon layer is filled with activated carbon, and the cavity wall of the granular bed moving bed reactor 3 is also provided with an ammonia injection device 6, and the ammonia injection device 6 is arranged between the granular layer and the activated carbon layer;

Among them, the SNCR denitrification device 1 is connected to the garbage incinerator through pipelines,

The flue gas outlet of the waste incinerator is connected to the flue gas inlet of the granular bed moving bed reactor 3, and the lime water preparation and injection device 2 is installed at the flue gas outlet of the waste incinerator and connected to the flue gas inlet of the granular bed moving bed reactor 3 Or, the lime water preparation and injection device 2 is directly connected to the flue gas inlet, and the front part of the cavity of the granular bed moving bed reactor 3 is surrounded by a granular layer or an activated carbon layer arranged in the cavity. a reaction chamber;

The flue gas detection and analysis device 11 is arranged at the front end of the particle bed moving bed reactor 3,

The induced draft fan 9 is arranged at the flue gas outlet of the granular bed moving bed reactor 3, and the discharge port of the induced draft fan 9 is connected with the chimney 10;

Granular layer moving bed reactor 3 is also connected with granular layer new material device 4, granular layer regeneration device 5, activated carbon regeneration device 7 and activated carbon new material device 8, specifically, the outlet of granular layer new material device 4 is connected with granular layer The feed port of the particle layer is communicated, the discharge port of the particle layer is connected with the feed port of the particle layer regeneration device 5, and the discharge port of the particle layer regeneration device 5 is connected with the feed port of the particle layer new material device 4, thus, the particles Layer new material device 4 forms an active particle circulation system with the granular layer on the granular bed moving bed reactor 3 and the granular layer regeneration device 5; meanwhile, the discharge port of the new activated carbon material device 8 is communicated with the feed inlet of the activated carbon layer, The discharge port of the activated carbon layer is communicated with the feed port of the activated carbon regeneration device 7, and the discharge port of the activated carbon regeneration device 7 is communicated with the feed port of the new activated carbon material device 8, thus, the activated carbon new material device 8 is connected with the particle layer moving bed The activated carbon layer on the reactor 3 and the activated carbon regeneration device 7 constitute an activated carbon circulation system.

In the waste incineration flue gas purification system provided in this embodiment, the SNCR denitration device 1 can partially remove nitrogen oxides (NO _x ) in the flue gas to complete the preliminary denitrification;

Lime water preparation and injection device 2 is used to prepare lime water and inject lime water into the flue gas that has undergone preliminary denitrification to neutralize hydrogen chloride (HCl), hydrogen fluoride (HF) and sulfur oxides (SO _x ) and other acidic substances to complete the initial deacidification; or, when the lime water preparation and injection device 2 is connected with the flue gas inlet of the granular bed moving bed reactor 3, the internal front part of the granular bed moving bed reactor 3 is provided Reaction chamber, so that lime water has sufficient space and time to perform preliminary deacidification of flue gas after preliminary denitrification;

The flue gas detection and analysis device 11 can detect and analyze before the flue gas enters the granular bed moving bed reactor 3, and according to the composition and concentration of the detected flue gas, the particle layer and the activated carbon layer in the granular bed moving bed reactor 3 are set. quantity;

The particle layer contains active particles for filtration and adsorption, and the activated carbon layer contains activated carbon for filtration and catalysis. The active particles can remove ash, hydrogen chloride (HCl), hydrogen fluoride (HF), and sulfur oxides in the flue gas (SO _x ), heavy metals such as lead, mercury, cadmium, and dioxins, etc. Activated carbon can be used as a catalyst and carrier to remove ash, hydrogen chloride (HCl), hydrogen fluoride (HF), and sulfur oxides (SO _x ), nitrogen oxides (NO _{x )} , heavy metals such as lead, mercury, and cadmium, and dioxins, etc., the ammonia water injection device 6 can spray ammonia water to the granular bed moving bed reactor 3 to neutralize part of the acidic substances, and at the same time make the activated carbon layer act as Catalyst and carrier to complete the secondary removal of nitrogen oxides (NO _x ) in the flue gas; and the granular bed moving bed reactor 3 can move slowly to expand the granular layer and activated carbon layer to ash, hydrogen chloride (HCl) in the flue gas , hydrogen fluoride (HF), sulfur oxides (SO _x ), nitrogen oxides (NO _{x )} , heavy metal elements such as lead, mercury, cadmium, and dioxins, etc. Removal in the device;

The active particle circulation system can enable the active particles used for filtration to be reused through regeneration; the activated carbon circulation system can enable the activated carbon used for filtration and catalysis to be reused through regeneration; through the above-mentioned active particle circulation system and activated carbon circulation system, it can Ensuring the activity of the granular bed moving bed reactor 3;

The induced draft fan 9 serves as the power source of the entire waste incineration flue gas purification system. Guided by the induced draft fan 9, the incineration flue gas undergoes a series of purification treatments. After reaching the emission standard, it is discharged into the atmosphere through the chimney 10.

This embodiment also provides a method for purifying waste incineration flue gas using the above-mentioned waste incineration flue gas purification system, which includes the following steps:

(1) Put domestic waste into an incinerator for incineration, and use SNCR denitrification device 1 to spray urea into the waste incinerator to initially remove nitrogen oxides (NO _x ) in the incineration flue gas to obtain preliminary denitrified flue gas;

(2) Then utilize the induced draft fan 9 to introduce the preliminary denitrated flue gas through the pipeline into the granular bed moving bed reactor 3, and in the pipeline leading into the granular bed moving bed reactor 3, utilize lime water preparation and injection device 2 to spray lime Water to neutralize acidic substances such as hydrogen chloride (HCl), hydrogen fluoride (HF) and sulfur oxides (SO _x ) in the preliminary denitrification flue gas for preliminary deacidification;

(3) Under the guidance of the induced draft fan 9, the flue gas through preliminary denitration and deacidification enters the granular bed moving bed reactor 3, and the granular layer in the granular bed moving bed reactor 3 is used as a carrier to remove hydrogen chloride (HCl) , hydrogen fluoride (HF), sulfur oxides (SO _x ) and other acidic substances, and the granular layer also traps some ash, dioxins and heavy metals, such as lead, mercury, cadmium, chromium, copper, etc.;

(4) After the granular layer removes ash, acidic substances, heavy metals and dioxins, the ammonia water injection device 6 sprays ammonia water to the granular layer moving bed reactor 3 to further neutralize the acidic substances and simultaneously make the granular layer moving bed react The activated carbon layer in device 3 acts as a catalyst and carrier to further remove nitrogen oxides (NO _x ) in the flue gas. The activated carbon layer also traps ash, dioxins and heavy metals in the flue gas, making the flue gas further Purify and meet emission standards;

(5) The flue gas that step (4) reaches the emission standard is discharged into the atmosphere through the chimney 10 through the induced draft fan 9;

Wherein, the number of particle layers and activated carbon layers can be adjusted according to the composition and concentration of the smoke detected by the smoke detection and analysis device 11. For example, when the dust content in the smoke is large, a widened particle layer can be set. Or set up two layers of granular layers; when the sulfur content in the flue gas is large, you can set up a widened activated carbon layer or set up two layers of activated carbon layers;

When the active particles in the granular layer are adsorbed and saturated, the granular layer is sent to the granular layer regeneration device 5 for desorption. At the same time, the granular layer fresh material device 4 feeds new active particles into the granular layer moving bed reactor 3 to form For the granular layer, proceed to step (3), and in the granular layer regeneration device 5, the ash, acidic substances, heavy metals and dioxins adsorbed in the granular layer are removed, and the active particles recover the adsorption capacity, and then the recovery The active particles of adsorption capacity are sent to the new material device 4 of the granular layer for subsequent use;

After the activated carbon adsorption in the activated carbon layer is saturated, the activated carbon layer is sent to the activated carbon regeneration device 7 for desorption. At the same time, the activated carbon new material device 8 inputs new activated carbon to the granular bed moving bed reactor 3 to form the activated carbon layer. Carry out step (4), in the activated carbon regeneration device 7, the ash, heavy metals and dioxins adsorbed in the activated carbon layer are removed, the activated carbon restores the adsorption capacity, and then the activated carbon with the restored adsorption capacity is sent to the new active carbon material Standby in device 8.

It can be seen from Example 1 that the waste incineration flue gas purification system provided by the utility model adopts a granular bed moving bed reactor for deacidification, denitrification, dust removal, and removal of heavy metals and dioxins, which simplifies the purification of waste incineration flue gas The technological process reduces the engineering cost; secondly, the garbage incineration flue gas purification system provided by the utility model does not use a bag filter, which avoids the generation of secondary pollutants; moreover, the garbage incineration flue gas provided by the utility model The purification system includes two denitrification devices, SNCR denitrification device and granular bed moving bed reactor, which can perform secondary removal of nitrogen oxides (NO _x ) in the incineration flue gas, improve denitrification efficiency, and reduce nitrogen oxide emissions. Reach the EU emission standard, and the waste incineration flue gas purification system provided by the utility model includes two deacidification devices of lime water preparation and spraying device and particle bed moving bed reactor, which can treat hydrogen chloride (HCl) and hydrogen fluoride in the incineration flue gas (HF), sulfur oxides (SO _x ) and other acidic substances are removed for the second time; in addition, the waste incineration flue gas purification system provided by the utility model has a complete material regeneration device and a new material replenishment device, which can make the filter use Both active particles and activated carbon can be recycled and reused through regeneration to ensure the activity of the particle bed moving bed reactor. Using the waste incineration flue gas purification system provided by the utility model, a new set of waste incineration flue gas purification process has been developed. The SNCR denitrification device and the particle bed moving bed reactor are used for two-stage denitrification reaction, and the lime water preparation and injection device are used. Perform two deacidification reactions with the granular bed moving bed reactor, and can realize deacidification, denitrification, dust removal, and removal of heavy metals and dioxins in the same granular bed moving bed reactor. The process is simple and the denitrification efficiency is high. , low energy consumption and environmental protection.

Claims (10)

1. a kind of flue gas purification system it is characterised in that: described flue gas purification system includes incinerator, sncr denitrification apparatus, stone Grey water unit, power set and granular layer moving-burden bed reactor；

Described granular layer moving-burden bed reactor is a structure containing cavity, and its front end is provided with smoke inlet, and rear end is provided with cigarette Gas exports；

Described sncr denitrification apparatus are connected with described incinerator；

Described incinerator is connected with described smoke inlet；Described power set are connected with described exhanst gas outlet；

Described Calx water unit is arranged on the pipeline that described incinerator is connected with described smoke inlet, or, described Calx Water unit is connected with described smoke inlet；

It is provided with least one granular layer and at least one active carbon layer in the cavity of described granular layer moving-burden bed reactor, described At least one ammonia import is additionally provided with the cavity wall of granular layer moving-burden bed reactor, described granular layer fills active Grain, described active carbon layer is filled with activated carbon, and described ammonia import is arranged between described granular layer and described active carbon layer.

2. flue gas purification system according to claim 1 it is characterised in that: described power set include air-introduced machine, described Air-introduced machine is arranged on the smoke outlet of described granular layer moving-burden bed reactor；

Described flue gas purification system also includes chimney, and described chimney is connected with described power set.

3. flue gas purification system according to claim 1 it is characterised in that: the cavity of described granular layer moving-burden bed reactor Internal front portion encloses formation reaction chamber with the granular layer of intracavity setting or active carbon layer.

4. flue gas purification system according to claim 1 it is characterised in that: the flue gas of described granular layer moving-burden bed reactor Porch is additionally provided with flue gas inspection analytical equipment.

5. flue gas purification system according to claim 1 it is characterised in that: described flue gas purification system also includes granular layer Virgin material device, described granular layer virgin material device is connected with the granular layer in described granular layer moving-burden bed reactor.

6. according to claim 1 or 5 flue gas purification system it is characterised in that: described flue gas purification system also includes Granulosa regenerating unit, described granular layer regenerating unit is connected with the granular layer in described granular layer moving-burden bed reactor.

7. flue gas purification system according to claim 6 it is characterised in that: described granular layer virgin material device and described granule Layer regenerating unit is connected.

8. flue gas purification system according to claim 1 it is characterised in that: described flue gas purification system also includes activated carbon Virgin material device, described activated carbon virgin material device is connected with the active carbon layer in described granular layer moving-burden bed reactor.

9. the flue gas purification system according to claim 1 or 8 it is characterised in that: described flue gas purification system also include live Property charcoal regenerating unit, described active carbon regenerating unit is connected with the active carbon layer in described granular layer moving-burden bed reactor.

10. flue gas purification system according to claim 9 it is characterised in that: described activated carbon virgin material device and described work Property charcoal regenerating unit is connected.