CN110252036A - Roasting flue gas defluorination, dust removal, deasphalting fume, desulfurization, denitrification integrated treatment method and system - Google Patents

Abstract

The invention relates to the field of flue gas treatment, in particular to an integrated treatment method and system for defluorination, dust removal, deasphalting fume, desulfurization, and denitrification of roasting flue gas. The method adopts regenerative incinerator + denitrification + alkaline dry adsorption to thoroughly treat roasting flue gas pollutants. The structure of the system is as follows: the flue at the outlet of the roaster is divided into two paths: along the way, filter, regenerative incinerator, flue of dust collector, circulating fluidized bed reactor, dust collector, flue after dust collector, induction The fan, the chimney, and the other road are connected to the lower part of the chimney through the first accident flue and the third accident flue. The second is connected with the flue after the dust collector. The invention is mainly applied to newly-built anode roasting flue gas treatment projects, existing anode roasting flue gas upgrading projects, and boiler and other flue gas desulfurization treatment projects.

Description

Roasting flue gas defluorination, dust removal, deasphalt fume, desulfurization, denitrification integrated treatment method and system

technical field

The present invention relates to the field of flue gas treatment, in particular to an integrated treatment method and system for defluorination, dust removal, deasphalting fume, desulfurization and denitrification of roasting flue gas. Flue gas upgrading projects, boiler and other flue gas desulfurization treatment projects.

Background technique

The main pollutant of the carbon plant in the electrolytic aluminum industry is the roasting flue gas produced during the anode roasting process, which contains harmful components such as asphalt fume, dust, fluoride, sulfur dioxide, nitrogen oxides, and benzopyrene. With the improvement of national environmental protection standards, the country has become more and more strict on various pollutant discharge indicators, and many new and existing enterprises are facing huge environmental protection pressure. The increase in sulfur content in carbon raw materials on the market has led to a substantial increase in the content of sulfur dioxide in the flue gas at the outlet of the roaster, making the emitted sulfur dioxide gas higher than the requirements of the national emission standards. In areas with strict control of individual pollutants, in addition to the total amount control, special treatment is also required for hydrogen fluoride, sulfur dioxide and other acid gases and nitrogen oxides, so that they are discharged far below the requirements of the national concentration emission standards.

At present, the main methods used in the purification of roasting flue gas are as follows:

(1) Electric tar catcher + dry process

The roasting flue gas generated from the roasting furnace is passed through an electric tar collector to collect tar and dust, and then the hydrogen fluoride gas is removed through alumina dry adsorption.

This method can remove tar, benzopyrene, dust and fluoride in the flue gas, but cannot remove sulfur dioxide and nitrogen oxides in the flue gas, and the tar captured by the electric tar collector is a hazardous waste. It needs to be processed a second time.

(2) Wet spray + electric tar catcher

The roasting flue gas generated from the roasting furnace is wet washed by cooling tower to remove hydrogen fluoride and sulfur dioxide, and then the dust and tar are removed by electric tar catcher.

This method can remove tar, sulfur dioxide, fluoride and some dust in the roasting flue gas, but it cannot remove benzopyrene and nitrogen oxides in the flue gas, and the dust and captured tar need secondary treatment.

(3) Incineration + alumina dry process

The roasting flue gas from the roaster is passed through the regenerative incinerator to remove tar and benzopyrene, and then the harmful gases such as fluoride and dust are removed through dry method.

This method also cannot remove sulfur dioxide and nitrogen oxides in the flue gas.

The above-mentioned methods all have disadvantages such as high energy consumption of the system, difficult treatment of secondary pollution, high investment in equipment, incomplete treatment of pollutants, and serious corrosion of equipment.

At the same time, with the development of the carbon industry, the pollutant emission standards may eventually be in line with world standards. The chimney dust emission of electrolytic aluminum plants reaches 5mg/Nm ³ , the total fluorine emission reaches 0.8mg/Nm ³ , and the nitrogen oxide emission reaches 100mg /Nm ³ , sulfur dioxide emission reaches 50mg/Nm ³ , and tar content reaches the final target value of 5mg/Nm ³ . Therefore, it is necessary to develop a new roasting flue gas purification process to deal with the roasting flue gas produced by the new carbon plant, or to carry out a comprehensive upgrade of the existing roasting flue gas purification system to meet the current and future national environmental protection standards needs.

Contents of the invention

The purpose of the present invention is to provide an integrated treatment method and system for defluorination, dust removal, deasphalt fume, desulfurization and denitrification of roasting flue gas, so as to solve the problems of high system energy consumption, difficult secondary pollution and high equipment investment in the prior art. , Incomplete treatment of pollutants, serious equipment corrosion and other problems.

Technical scheme of the present invention is:

An integrated treatment method for defluorination, dust removal, deasphalt fume, desulfurization, and denitrification of roasting flue gas. It uses regenerative incinerator + denitrification + alkaline dry adsorption to thoroughly treat roasting flue gas pollutants. The specific treatment process is as follows:

The roasting flue gas first passes through the outlet flue of the roaster, passes through the filter installed in the pipe, filters out part of the dust and tar, and then enters the regenerative incinerator, and uses the gas added by the incinerator to treat the tar and benzo in the flue gas. Pyrene, the nitrogen oxide reducing agent is sprayed into the reducing agent nozzle in the high temperature zone of the regenerative incinerator to complete the nitrogen oxide treatment; the flue gas in the regenerative incinerator enters the circulating fluidized bed reactor through the flue of the dust collector, Adsorbent is added to the circulating fluidized bed reactor, and cold water is added to the circulating fluidized bed reactor through the water pump and the cold water spray port for cooling and humidification. Under the action of chemical water, the adsorption reaction is completed; after the adsorption reaction, the flue gas and alkaline particles enter the dust collector, and the filtration is completed to achieve the purpose of gas-solid separation. The treated flue gas meets the standard discharge, and the flue gas passes through the flue and induced draft fan , is discharged into the atmosphere through the chimney, and the filtered dust is disposed of in a harmless landfill.

In the integrated treatment method of defluorination, dust removal, deasphalt fume, desulfurization and denitrification of the roasting flue gas described above, the adsorbent is fed into the material bin by the tanker 1, then added to the pneumatic chute 2 by the rotary feeding valve 2, and added to the Circulating fluidized bed reactor, after completing the adsorption reaction with flue gas in the circulating fluidized bed reactor, it enters the dust collector together; the gas-solid separation is completed in the dust collector, and the filtered adsorbent enters the air lifter from the air chute Or the pressure tank, powered by the Roots blower, lifts the reacted adsorbent to the return bin, and feeds it into the tank car three by the rotary feeding valve three for subsequent processing.

In the integrated treatment method of roasting flue gas defluorination, dust removal, deasphalt fume, desulfurization and denitrification, the reducing agent sprayed in the regenerative incinerator is transported to the reducing agent storage tank by the tank truck three, and sprayed into the regenerative incinerator through the nozzle. The high-temperature zone of the incinerator completes the reduction of nitrogen oxides in the furnace; the adsorbent separated from the dust collector enters the pneumatic chute three through the rotary feeding valve one, and then is transported to the circulating fluidized bed reaction by the three pneumatic chute device.

An integrated treatment system for roasting flue gas defluorination, dust removal, deasphalt fume, desulfurization, and denitrification, the specific structure is as follows:

The outlet flue of the roaster is divided into two paths: one path is equipped with filter, regenerative incinerator, dust collector flue, circulating fluidized bed reactor, dust collector, dust collector rear flue, induced draft fan, chimney, and the other path The accidental flue 1 and the accidental flue 3 are connected with the lower part of the chimney in turn. The accidental flue 1 is connected with the flue of the dust collector through a pipeline, and the accidental flue 1 is also connected with the rear flue of the dust collector through the accidental flue 2. The road is connected.

In the integrated treatment system for roasting flue gas defluorination, dust removal, deasphalt fume, desulfurization, and denitrification, the regenerative incinerator is located between the filter and the circulating fluidized bed reactor, and the upper high-temperature zone in the regenerative incinerator is A reducing agent nozzle is provided. The reducing agent nozzle is connected to the bottom of the reducing agent storage tank through a pipeline, and the top of the reducing agent storage tank is connected to the second phase of the tank car containing the reducing agent through a pipeline. The reducing agent nozzle continuously sprays the reducing agent. The nitrogen oxides in the flue gas entering the regenerative incinerator are reduced to N ₂ .

In the integrated treatment system for roasting flue gas defluorination, dust removal, deasphalt fume, desulfurization, and denitrification, the water pump is connected to the cold water spray port through the pipeline, and the cold water spray port is arranged in the circulating fluidized bed reactor, and the circulating fluidized The atomized cooling water is sprayed into the bed reactor; the top of the material bin is connected with the tanker 1 through the pipeline, the bottom of the material bin is connected with one end of the pneumatic chute 2 through the pipeline, and the other end of the pneumatic chute 2 is connected with the circulation The lower part in the fluidized bed reactor is connected.

In the integrated treatment system for roasting flue gas defluorination, dust removal, deasphalt fume, desulfurization, and denitrification, the water pump is connected to the accident water nozzle through the pipeline, and the accident water nozzle is located in the accident flue one, and the cold water passes through the water pump and the pipeline Connected to the accident water spray port, once the accident flue is sprayed with internal cooling water, emergency treatment occurs when the flue catches fire.

In the integrated treatment system for roasting flue gas defluorination, dust removal, deasphalt fume, desulfurization, and denitrification, the dust collector is located between the circulating fluidized bed reactor and the induced draft fan, and the bottom of the dust collector is connected to the pneumatic chute through a pipeline. One end of the three is connected, and the other end of the air chute three is connected with the lower part of the circulating fluidized bed reactor; the bottom of the dust collector is connected with one end of the air chute one through another pipeline, and the air chute one The other end is connected with the top of the air lift or pressure tank through the pipeline; the top of the air lift or pressure tank is also connected with the top of the return bin through the pipeline, and the bottom of the return bin is connected with the tank car three through the pipeline Through the pipeline, the bottom of the air lifter or the pressure tank is connected with the Roots blower through the pipeline.

In the integrated treatment system for defluorination, dust removal, deasphalting fume, desulfurization, and denitrification of roasting flue gas, the adsorbent in the system is alkaline particles, and the alkaline particles are Ca(OH) ₂ , CaCO ₃ , MgCO ₃ , Mg One or more mixtures of (OH) ₂ and NaOH, the particle size of the basic particles is 1 μm to 2 cm; or, the adsorbent in the system is a mixture mainly composed of CaO and MgO oxides, or a mixture of metal catalysts Mixture form.

In the integrated treatment system for roasting flue gas defluorination, dust removal, deasphalt fume, desulfurization, and denitrification, the reducing agents in the system are ammonia NH ₃ , urea (CO(NH ₂ ) ₂ ), hydrogen acid ((HCNO) ₃ ) or other modified amino reducing agents.

Design idea of the present invention is:

In order to deal with the complex pollutant components of roasting flue gas, the present invention specially adopts the integrated treatment technology of roasting flue gas. The flue gas from the roaster first passes through the regenerative incinerator (RTO) to remove asphalt smoke and benzopyrene in the flue gas; spray a special denitrification agent into the RTO to perform high-temperature selective non-catalytic reduction denitrification to remove the flue gas nitrogen oxides; the flue gas discharged from the RTO enters the circulating fluidized bed semi-dry desulfurization (CFD) system or NID (New Integrated Desulfurization) dry desulfurization technology, and reacts with the added Ca(OH) ₂ powder to treat the flue gas Sulfur dioxide in the gas; the flue gas enters the bag filter to filter out the dust in the flue gas, and the purified flue gas is discharged into the atmosphere through the fan and chimney. The reactants after absorbing sulfur dioxide are landfilled or used as building materials, and the high-temperature flue gas after RTO can be used for waste heat recovery.

Advantage of the present invention and beneficial effect are:

1. The present invention is applicable to the purification of roasting flue gas in carbon plants, and is also applicable to industries or fields that produce tar, dust and acidic gases during the production process, such as coking, etc. The invention removes pollutants such as dust, tar, benzopyrene, hydrogen fluoride, sulfur dioxide and nitrogen oxides in flue gas, and is a comprehensive method for controlling multi-pollutant gas.

2. The present invention can realize the thorough treatment of organic pollutants, especially the treatment of various flue gases with complex components, and the system has high stability; equipment, pipes, and chimneys are free from corrosion, and secondary pollution is eliminated. The equipment is easy to maintain and has a high degree of self-control . At present, the integrated treatment technology of roasting flue gas has undergone separate experiments and engineering applications, and is undergoing technology integration application research and market promotion, which has a high market prospect.

Description of drawings

Fig. 1 is a schematic flow chart of Embodiment 1 of the present invention.

In the figure: 1. Calciner exit flue; 2. Regenerative incinerator; 3. Dust collector flue; 4. Circulating fluidized bed reactor; 5. Dust collector; 6. Dust collector rear flue; 7. Induced fan; 8. Accident flue one; 9. Accident flue two; 10. Accident flue three; 11. High-pressure centrifugal fan; 12. Roots blower; 13. Pneumatic lifter or pressure tank; 14. Pneumatic chute 1; 15. Rotary feed valve 1; 16. Rotary feed valve 2; 17. Tanker 1; 18. Material warehouse; 19. Return warehouse; 20. Chimney; 21. Water pump; 22. Cold water spray port; 23. Accident spout; 24. Rotary feeding valve three; 25. Filter; 26. Reductant storage tank; 27. Reductant nozzle; 28. Tank car two; 29. Tank car three; 30. Pneumatic chute two; 31. Pneumatic chute three.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited by the schematic diagrams.

As shown in Figure 1, the integrated treatment system of roasting flue gas defluorination, dedusting, deasphalting smoke, desulfurization and denitrification of the present invention, main equipment and parts in this system are pipeline, filter, regenerative incinerator, reactor ( Gas-solid mixer), dust collector, induced draft fan, spray humidification device, filter, material conveying device, pipeline, auxiliary fan, etc. The main split structure includes: roaster outlet flue 1, regenerative incinerator 2, Dust collector flue 3, circulating fluidized bed reactor 4, dust collector 5, dust collector rear flue 6, induced draft fan 7, emergency flue one 8, accident flue two 9, accident flue three 10, high-pressure centrifugal fan 11. Roots blower 12, air lifter or pressure tank 13, pneumatic chute 14, rotary feeding valve 15, rotary feeding valve 2 16, tanker 17, material bin 18, return bin 19, chimney 20, Water pump 21, cold water spout 22, accident spout 23, rotary feeding valve 3 24, filter 25, reductant storage tank 26, reductant nozzle 27, tank car 2 28, tank car 3 29, pneumatic chute 2 30 , Pneumatic chute three 31, etc., the specific structure is as follows:

The flue 1 at the outlet of the roasting furnace is divided into two roads: along the way, filter 25, regenerative incinerator 2, dust collector flue 3, circulating fluidized bed reactor 4, dust collector 5, dust collector rear flue 6, Induced fan 7, chimney 20, valve 1# and valve 2# are set at the inlet and outlet of regenerative incinerator 2, valve 3# is set on dust collector flue 3, circulating fluidized bed reactor 4, dust collector Set valve 4# on the pipeline connected with 5, set valve 5# on the pipeline connected with dust collector 5 and rear flue 6 of dust collector, and set valve 6# and valve 7# at the inlet and outlet of induced draft fan 7 respectively. The other road passes through accidental flue one 8, accidental flue three 10 and the lower part of the chimney 20 in turn, and the outlet flue 1 of the roaster is connected with the accidental flue one 8 to set valve 9#, and the accidental flue three 10 is connected to the chimney Valve 11# is set at the intersection of 20, accident flue one 8 is connected with dust collector flue 3 through a pipeline (the valve 10# is set on the pipeline), and accident flue one 8 also passes through accident flue two 9 (accident flue The second flue 9 is provided with a valve 8#) and communicates with the rear flue 6 of the dust collector.

A filter 25 is arranged between the regenerative incinerator 2 and the roaster. The filter 25 is a steel wire filter or a non-metallic filter, and its function is to filter out particles and part of tar in the flue gas. The number of filters 25 is 1 to 10, which can be used for mutual backup.

The regenerative incinerator 2 is between the filter 25 and the circulating fluidized bed reactor 4. The regenerative incinerator 2 injects gas, and the roasting flue gas incineration task is completed in the regenerative incinerator 2. The regenerative incinerator 2. Distributed heat can recover waste heat, which can be used to heat roasting flue gas or other processes. The number of regenerative incinerators 2 is 1 to 10, and the regenerative incinerators 2 are equipped with an automatic cleaning device, which can use high-temperature flue gas to clean dust and tar inside the equipment. The upper high-temperature zone in the regenerative incinerator 2 is provided with a reducing agent nozzle 27, and the reducing agent nozzle 27 communicates with the bottom of the reducing agent storage tank 26 through a pipeline (valve 12# is set on the pipeline), and the reducing agent storage tank The top of 26 is connected with the tank car 2 28 containing the reductant through pipelines, and the reductant nozzle 27 sprays the reductant continuously to reduce the nitrogen oxides in the flue gas entering the regenerative incinerator 2 into N ₂ .

The circulating fluidized bed reactor 4 is made of ordinary steel, wear-resistant steel or other alloys, and serves as a mixed reactor for gas and solid particles. The water pump 21 is connected to the cold water spray port 22 through a pipeline, the cold water spray port 22 is arranged in the circulating fluidized bed reactor 4, and the atomized cooling water is sprayed into the circulating fluidized bed reactor 4, and the atomized cooling water can be supplied by high pressure The circulating water pump is provided or the water pump is combined with compressed air. The number of the circulating fluidized bed reactor 4 is 1 to 10, and the circulating fluidized bed reactor 4 is provided with a reflux system to ensure that the flue gas flow at the inlet of the circulating fluidized bed reactor 4 is controllable. The top of the material bin 18 is connected with the tank truck 1 17 through a pipeline, the bottom of the material bin 18 is connected with one end of the pneumatic chute 2 30 through a pipeline, and the other end of the pneumatic chute 2 30 is connected with the circulating fluidized bed reactor 4 The lower part of the interior is connected.

In addition, the water pump 21 is connected to the accident water nozzle 23 through the pipeline, and the accident water nozzle 23 is located in the accident flue one 8. During the operation of the whole system, the cold water is connected to the accident water nozzle 23 through the water pump 21 and the pipeline, and the accident water Flue one 8 is sprayed with internal cooling water, and emergency treatment occurs when the flue catches fire.

The dust collector 5 is located between the circulating fluidized bed reactor 4 and the induced draft fan 7 to filter dust. The dust collector 5 can be a pulse bag dust collector, a reverse blowing bag dust collector or a rotary jet bag dust collector, and the number of dust collectors 5 is 1 to 10. The bottom of dust collector 5 communicates with one end of pneumatic chute three 31 through a pipeline (rotary feeding valve one 15 is arranged on the pipeline), and the other end of pneumatic chute three 31 is connected with circulating fluidized bed reactor 4. The lower part is connected. The bottom of dust collector 5 is communicated with an end of pneumatic chute one 14 by another pipeline, and the other end of pneumatic chute one 14 is communicated with the top in air lifter or pressure tank 13 by pipeline. The top in the air lifter or the pressure tank 13 is also communicated with the top of the return bin 19 through a pipeline, and the bottom of the return bin 19 is communicated with the tank truck 3 29 through a pipeline (rotary feeding valve 3 24 is set on the pipeline) , the bottom of the air lifter or the pressure tank 13 communicates with the Roots blower 12 through a pipeline.

The induced draft fan 7 is located between the dust collector 5 and the chimney 20, and the number of the induced draft fan 7 is 1 to 4, which can be variable frequency fans, industrial frequency fans, high pressure fans or low pressure fans. The high-pressure centrifugal fan 11 is respectively connected by pipelines: the material bin 18, the second pneumatic chute 30, the third pneumatic chute 31, the first pneumatic chute 14, and the return bin 19. source.

There are multiple backup channels inside the whole set of purification system, which will not affect the overall operation of the system in the event of failure or maintenance of individual equipment. The adsorbent in the system is alkaline granule, which is one or a mixture of two or more of Ca(OH) ₂ , CaCO ₃ , MgCO ₃ , Mg(OH) ₂ and NaOH, and the particle size of the basic granule is 1μm～2cm. The adsorbent in the system can also be a mixture mainly composed of CaO, MgO and other oxides, or a mixture with metal catalysts added. The reactant (reductant) selected for selective non-catalytic reduction and denitrification in the system is ammonia NH ₃ , urea (CO(NH ₂ ) ₂ ), hydrogen acid ((HCNO) ₃ ) or other modified amino reducing agents, A reducing agent is sprayed into the high temperature zone of the regenerative incinerator 2 to reduce nitrogen oxides to nitrogen. The system is provided with material bins 18 and chimneys 20, the number of material bins 18 is 1-4, and the number of chimneys 20 is 1-4.

In addition, multiple temperature and pressure detection devices are installed in the system as needed to monitor the operation in real time and adjust the operation parameters at any time. Fire detection and flood and steam fire extinguishing devices are installed in the system. The system is equipped with a material conveying and metering system to facilitate the transportation of alkaline granular materials and reducing agents.

As shown in Figure 1, the present invention is an integrated treatment technology for roasting furnace flue gas. It adopts regenerative incinerator + denitrification + alkaline dry adsorption to thoroughly treat roasting flue gas pollutants. The specific treatment process is as follows:

The roasting flue gas first passes through the outlet flue 1 of the roasting furnace, passes through the filter 25 installed in the pipe, filters out part of the dust and tar, and then enters the regenerative incinerator 2, and uses the gas added by the incinerator to process the tar in the flue gas and benzopyrene, the nitrogen oxide reducing agent is sprayed into the reducing agent nozzle 27 in the high temperature zone of the regenerative incinerator 2 to complete the nitrogen oxide treatment. The flue gas in the regenerative incinerator 2 enters the circulating fluidized bed reactor 4 through the dust collector flue 3, and the adsorbent is added in the circulating fluidized bed reactor 4, and the cold water is added to the circulating fluidized bed reactor 4 through the water pump 21 and the cold water spray port 22 The circulating fluidized bed reactor 4 is cooled and humidified, and the adsorption reaction is completed with the alkaline particles in the circulating fluidized bed reactor 4 under the action of sprayed atomized water. After the adsorption reaction, the flue gas and alkaline particles enter the dust collector 5, and the filtration is completed to achieve the purpose of gas-solid separation. The treated flue gas is discharged up to the standard. Atmosphere, the filtered dust is treated in a harmless landfill.

The adsorbent is fed into the material bin 18 by the tank car 17, and then added to the pneumatic chute 2 30 by the rotary feeding valve 2 16, and then added to the circulating fluidized bed reactor 4, and in the circulating fluidized bed reactor 4, it is mixed with the flue gas After the gas completes the adsorption reaction, it enters the dust collector 5 together. Gas-solid separation is completed in the dust collector 5, and the filtered adsorbent enters the air lift or pressure tank 13 from the pneumatic chute-14, and the Roots blower 12 provides power to lift the reacted adsorbent to the return bin 19, and Rotary feeding valve three 24 feeds into the tank car three 29 for follow-up processing.

Part of the adsorbent separated from the dust collector 5 enters the three pneumatic chute 31 through the rotary feeding valve one 15, and then is transported to the circulating fluidized bed reactor 4 by the three pneumatic chute 31.

The reducing agent sprayed in the regenerative incinerator 2 is transported by the tank truck 3 29 to the reducing agent storage tank 26, and sprayed into the high temperature area of the regenerative incinerator 2 through the nozzle 27 to complete the reduction of nitrogen oxides in the furnace.

When the system is in normal working condition, valves 8#, 9#, 10#, and 11# are closed. The other valves are open, and the flue gas passes through the outlet flue 1 of the roaster, the filter 25, the regenerative incinerator 2, the flue of the dust collector 3, the circulating fluidized bed reactor 4, the dust collector 5, and the flue after the dust collector 6. The induced draft fan 7 is discharged into the atmosphere by the chimney 20.

When the regenerative incinerator 2 in the system needs to be overhauled, the valves 1#, 2#, 8#, and 11# are in the closed state, and the other valves on the pipeline are in the open state, and the flue gas passes through the outlet flue 1 of the roaster, the dust collector flue Road 3, circulating fluidized bed reactor 4, dust remover 5, flue 6 after dust remover, induced draft fan 7, discharged into the atmosphere by chimney 20.

When the reductant delivery system in the system fails, close the valves 1#, 2#, 8#, 11#, 12#, open other valves on the pipeline, and the flue gas passes through the outlet flue 1 of the roaster, the dust collector flue 3, Circulating fluidized bed reactor 4, dust remover 5, flue 6 after dust remover, induced draft fan 7 are discharged into the atmosphere through chimney 20.

When the dust collector system or material transportation in the system fails, valves 3#, 5#, 9#, and 11# are closed, other valves on the pipeline are open, and the flue gas passes through the roaster outlet flue 1 and filter 25 , regenerative incinerator 2, dust collector flue 3, accident flue one 8, accident flue two 9, induced draft fan 7, discharged into the atmosphere by chimney 20.

When the flue is on fire, or there is a problem with both the incinerator 2 and the dust collector 5, the valves 9# and 11# are in the open state, and the other valves are in the closed state. Accident flue three 10 is discharged into atmosphere by chimney 20.

Claims (10)

1. a kind of baking flue gas defluorinate, dedusting, depitching cigarette, desulphurization and denitration integral treatment method, which is characterized in that use Thermal accumulating incinerator+denitration+alkalinity Dry Adsorption thoroughly handles baking flue gas pollutant, and concrete processing procedure is as follows:

Baking flue gas passes through roaster exhaust pass first, and the filter being arranged in piping filters out part dust and coke Oil enters back into thermal accumulating incinerator, tar and BaP in flue gas is disposed using the combustion gas that incinerator is added, in heat accumulating type The reductant nozzle of incinerator high-temperature region sprays into NOx reducing agent, completes nitrogen oxides treatment；In thermal accumulating incinerator Flue gas enters circulating fluid bed reactor by deduster flue, and adsorbent, cold water warp are added in circulating fluid bed reactor Water pump and cold water water jet be added to circulating fluid bed reactor carry out decreasing temperature and increasing humidity, in circulating fluid bed reactor with alkalinity Particulate matter completes adsorption reaction under the atomized water effect of penetrating；Flue gas and alkaline particle after adsorption reaction enter dedusting Device completes filtering and reaches gas solid separation purpose, treated flue gas qualified discharge, flue gas through deduster rear pass and air-introduced machine, Atmosphere is discharged by chimney, the innoxious landfill disposal of the dust filtered out.

2. baking flue gas defluorinate described in accordance with the claim 1, dedusting, depitching cigarette, desulphurization and denitration integral treatment method, It is characterized in that, adsorbent is by tank car, a dozen expect material bin, then are added to air-driven chute two by rotatory feeder valve two, are added to Circulating fluid bed reactor enters deduster after completing adsorption reaction with flue gas in circulating fluid bed reactor together；It is removing Gas solid separation is completed in dirt device, the adsorbent filtered out enters Pneumatic lift or pressurized tank, roots blower by air-driven chute one There is provided power, by after reaction adsorbent promoted to return storehouse, by expected in tank car three under rotatory feeder valve three carry out it is subsequent Reason.

3. baking flue gas defluorinate described in accordance with the claim 1, dedusting, depitching cigarette, desulphurization and denitration integral treatment method, It is characterized in that, the reducing agent sprayed in thermal accumulating incinerator is transported to reducing agent storage tank by tank car three, accumulation of heat is sprayed into through nozzle The high-temperature region of formula incinerator, completion restore nitrogen oxides in furnace；The adsorbent separated from deduster, partially by rotation Feed valve one enters air-driven chute three, then is transported in circulating fluid bed reactor by air-driven chute three.

4. a kind of dedicated baking flue gas defluorinate of one of claims 1 to 3 the method, dedusting, depitching cigarette, desulphurization and denitration Integrated processing system, which is characterized in that specific structure is as follows:

Roaster exhaust pass divides two-way: setting gradually filter, thermal accumulating incinerator, deduster flue, recycle stream on the way Fluidized bed reactor, deduster, deduster rear pass, air-introduced machine, chimney, another way pass sequentially through accident flue one, accident flue Three are connected with the lower part in chimney, and accident flue one is connected by a pipeline with deduster flue, and accident flue one is also It is connected by accident flue two with deduster rear pass.

5. baking flue gas defluorinate, dedusting, depitching cigarette, desulphurization and denitration integrated processing system according to claim 4, It is characterized in that, thermal accumulating incinerator, among filter and circulating fluid bed reactor, the top in thermal accumulating incinerator is high Warm area is equipped with reductant nozzle, and reductant nozzle is connected by pipeline with the bottom of reducing agent storage tank, the top of reducing agent storage tank Portion is connected by pipeline with the tank car two for holding reducing agent, and reductant nozzle continuously sprays reducing agent, will burn into heat accumulating type The nitrogen oxides in effluent for burning furnace is reduced to N₂。

6. baking flue gas defluorinate, dedusting, depitching cigarette, desulphurization and denitration integrated processing system according to claim 4, It is characterized in that, water pump, by piping connection cold water water jet, cold water water jet is set in circulating fluid bed reactor, recycle Atomization cooling water is sprayed into fluidized-bed reactor；The top of material bin is connected by pipeline with tank car one, the bottom of material bin It is connected by pipeline with one end of air-driven chute two, the lower part in the other end and circulating fluid bed reactor of air-driven chute two It is connected.

7. baking flue gas defluorinate, dedusting, depitching cigarette, desulphurization and denitration integrated processing system according to claim 4, It is characterized in that, water pump, by piping connection emergency spray mouth, emergency spray mouth is located in accident flue one, cold water through water pump with Pipeline is connected to emergency spray mouth, and accident flue one sprays into interior cooling water, and the case where flue kindling occurs in emergency processing.

8. baking flue gas defluorinate, dedusting, depitching cigarette, desulphurization and denitration integrated processing system according to claim 4, It is characterized in that, deduster is between circulating fluid bed reactor and air-introduced machine, the bottom of deduster by a pipeline with One end of air-driven chute three is connected, and the other end of air-driven chute three is connected with the lower part in circulating fluid bed reactor；It removes The bottom of dirt device is connected by another pipeline with one end of air-driven chute one, and the other end of air-driven chute one passes through pipeline and gas Top in power elevator or pressurized tank is connected；Top in Pneumatic lift or pressurized tank also passes through pipeline and returns to storehouse Top is connected, and the bottom for returning to storehouse is connected by pipeline with tank car three, and the bottom in Pneumatic lift or pressurized tank passes through Pipeline is connected with roots blower.

9. baking flue gas defluorinate, dedusting, depitching cigarette, desulphurization and denitration integrated processing system according to claim 4, It is characterized in that, the adsorbent in system is alkali grain, alkali grain is Ca (OH)₂、CaCO₃、MgCO₃、Mg(OH)₂With The mixture of one or more of NaOH, alkali grain partial size are 1 μm~2cm；Alternatively, in system adsorbent be with Mixture based on CaO, MgO oxide, or the form of mixtures of addition metallic catalyst.

10. baking flue gas defluorinate, dedusting, depitching cigarette, desulphurization and denitration integrated processing system according to claim 4, It is characterized in that, the reducing agent in system is ammonia NH₃, urea (CO (NH₂)₂), hydrogen propylhomoserin ((HCNO)₃) or other be modified ammonia Base reductant.